Strix
26.1K

CVE-2026-20012

HIGHCVSS 8.6/10EPSS 0.35%

Last modified

CVE-2026-20012 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. A vulnerability in the Internet Key Exchange version 2 (IKEv2) feature of Cisco IOS Software, Cisco IOS XE Software, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a memory leak, resulting in a denial of service (DoS) condition on an affected device. This vulnerability is due to improper parsing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

Description

A vulnerability in the Internet Key Exchange version 2 (IKEv2) feature of Cisco IOS Software, Cisco IOS XE Software, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a memory leak, resulting in a denial of service (DoS) condition on an affected device. This vulnerability is due to improper parsing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. A successful exploit of Cisco IOS Software and IOS XE Software could allow the attacker to cause the affected device to reload, resulting in a DoS condition. A successful exploit of Cisco Secure Firewall ASA Software and Secure FTD Software could allow the attacker to partially exhaust system memory, resulting in system instability, such as the inability to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover from this condition.

Metrics

CVSS 3.1
8.6/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS Probability
0.35%

27.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
CiscoIOS15.2(1)S; 15.2(2)S; 15.2(1)S1; 15.2(4)S; 15.2(1)S2; 15.2(2)S1; 15.2(2)S2; 15.2(2)S0a; 15.2(2)S0c; 15.2(4)S1; 15.2(4)S4; 15.2(4)S6; 15.2(4)S2; 15.2(4)S5; 15.2(4)S3; 15.2(4)S3a; 15.2(4)S4a; 15.2(4)S7; 15.3(1)T; 15.3(2)T; 15.3(1)T1; 15.3(1)T2; 15.3(1)T3; 15.3(1)T4; 15.3(2)T1; 15.3(2)T2; 15.3(2)T3; 15.3(2)T4; 15.0(2)EY; 15.0(2)EY1; 15.0(2)EY2; 15.0(2)EY3; 15.1(2)S; 15.1(1)S; 15.1(1)S1; 15.1(3)S; 15.1(1)S2; 15.1(2)S1; 15.1(2)S2; 15.1(3)S1; 15.1(3)S0a; 15.1(3)S2; 15.1(3)S4; 15.1(3)S3; 15.1(3)S5; 15.1(3)S6; 15.1(3)S5a; 15.1(4)M3; 15.1(4)M; 15.1(4)M1; 15.1(4)M2; 15.1(4)M6; 15.1(4)M5; 15.1(4)M4; 15.1(4)M7; 15.1(4)M3a; 15.1(4)M10; 15.1(4)M8; 15.1(4)M9; 15.0(2)SE; 15.0(2)SE1; 15.0(2)SE2; 15.0(2)SE3; 15.0(2)SE4; 15.0(2)SE5; 15.0(2)SE6; 15.0(2)SE7; 15.0(2)SE8; 15.0(2)SE9; 15.0(2)SE10; 15.0(2)SE11; 15.0(2)SE10a; 15.0(2)SE12; 15.0(2)SE13; 15.1(2)GC; 15.1(2)GC1; 15.1(2)GC2; 15.1(4)GC; 15.1(4)GC1; 15.1(4)GC2; 15.1(1)SG; 15.1(2)SG; 15.1(1)SG1; 15.1(1)SG2; 15.1(2)SG1; 15.1(2)SG2; 15.1(2)SG3; 15.1(2)SG4; 15.1(2)SG5; 15.1(2)SG6; 15.1(2)SG7; 15.1(2)SG8; 15.2(4)M; 15.2(4)M1; 15.2(4)M2; 15.2(4)M4; 15.2(4)M3; 15.2(4)M5; 15.2(4)M8; 15.2(4)M10; 15.2(4)M7; 15.2(4)M6; 15.2(4)M9; 15.2(4)M6a; 15.2(4)M11; 15.2(1)GC; 15.2(1)GC1; 15.2(1)GC2; 15.2(2)GC; 15.2(3)GC; 15.2(3)GC1; 15.2(4)GC; 15.2(4)GC1; 15.2(4)GC2; 15.2(4)GC3; 15.1(1)SY; 15.1(1)SY1; 15.1(2)SY; 15.1(2)SY1; 15.1(2)SY2; 15.1(1)SY2; 15.1(1)SY3; 15.1(2)SY3; 15.1(1)SY4; 15.1(2)SY4; 15.1(1)SY5; 15.1(2)SY5; 15.1(2)SY4a; 15.1(1)SY6; 15.1(2)SY6; 15.1(2)SY7; 15.1(2)SY8; 15.1(2)SY9; 15.1(2)SY10; 15.1(2)SY11; 15.1(2)SY12; 15.1(2)SY13; 15.1(2)SY14; 15.1(2)SY15; 15.1(2)SY16; 15.3(1)S; 15.3(2)S; 15.3(3)S; 15.3(1)S2; 15.3(1)S1; 15.3(2)S2; 15.3(2)S1; 15.3(3)S1; 15.3(3)S2; 15.3(3)S3; 15.3(3)S6; 15.3(3)S4; 15.3(3)S1a; 15.3(3)S5; 15.3(3)S7; 15.3(3)S8; 15.3(3)S9; 15.3(3)S10; 15.3(3)S8a; 15.4(1)T; 15.4(2)T; 15.4(1)T2; 15.4(1)T1; 15.4(1)T3; 15.4(2)T1; 15.4(2)T3; 15.4(2)T2; 15.4(1)T4; 15.4(2)T4; 15.0(2)EA; 15.0(2)EA1; 15.2(1)E; 15.2(2)E; 15.2(1)E1; 15.2(3)E; 15.2(1)E2; 15.2(1)E3; 15.2(2)E1; 15.2(4)E; 15.2(3)E1; 15.2(2)E2; 15.2(2a)E1; 15.2(2)E3; 15.2(2a)E2; 15.2(3)E2; 15.2(3a)E; 15.2(3)E3; 15.2(4)E1; 15.2(2)E4; 15.2(2)E5; 15.2(4)E2; 15.2(3)E4; 15.2(5)E; 15.2(4)E3; 15.2(2)E6; 15.2(5a)E; 15.2(5)E1; 15.2(5b)E; 15.2(2)E5a; 15.2(5c)E; 15.2(2)E5b; 15.2(5a)E1; 15.2(4)E4; 15.2(2)E7; 15.2(5)E2; 15.2(6)E; 15.2(4)E5; 15.2(5)E2c; 15.2(2)E8; 15.2(6)E0a; 15.2(6)E1; 15.2(6)E0c; 15.2(4)E6; 15.2(6)E2; 15.2(2)E9; 15.2(4)E7; 15.2(7)E; 15.2(2)E10; 15.2(4)E8; 15.2(6)E2a; 15.2(6)E2b; 15.2(7)E1; 15.2(7)E0a; 15.2(7)E0b; 15.2(7)E0s; 15.2(6)E3; 15.2(4)E9; 15.2(7)E2; 15.2(7a)E0b; 15.2(4)E10; 15.2(7)E3; 15.2(7)E1a; 15.2(7b)E0b; 15.2(7)E2a; 15.2(4)E10a; 15.2(7)E4; 15.2(7)E3k; 15.2(8)E; 15.2(8)E1; 15.2(7)E5; 15.2(7)E6; 15.2(8)E2; 15.2(4)E10d; 15.2(7)E7; 15.2(8)E3; 15.2(7)E8; 15.2(8)E4; 15.2(7)E9; 15.2(8)E5; 15.2(8)E6; 15.2(7)E10; 15.2(7)E11; 15.2(8)E7; 15.2(7)E12; 15.2(8)E8; 15.2(7)E13; 15.2(2)JB; 15.2(2)JB2; 15.2(4)JB; 15.2(2)JB3; 15.2(4)JB1; 15.2(4)JB3; 15.2(4)JB3a; 15.2(2)JB4; 15.2(4)JB4; 15.2(4)JB3b; 15.2(4)JB3s; 15.2(4)JB5; 15.2(4)JB5m; 15.2(4)JB6; 15.2(2)JB5; 15.2(2)JB6; 15.4(1)S; 15.4(2)S; 15.4(3)S; 15.4(1)S1; 15.4(1)S2; 15.4(2)S1; 15.4(1)S3; 15.4(3)S1; 15.4(2)S2; 15.4(3)S2; 15.4(3)S3; 15.4(1)S4; 15.4(2)S3; 15.4(2)S4; 15.4(3)S4; 15.4(3)S5; 15.4(3)S6; 15.4(3)S7; 15.4(3)S6a; 15.4(3)S8; 15.4(3)S9; 15.4(3)S10; 15.2(2)JAX; 15.3(3)M; 15.3(3)M1; 15.3(3)M2; 15.3(3)M3; 15.3(3)M5; 15.3(3)M4; 15.3(3)M6; 15.3(3)M7; 15.3(3)M8; 15.3(3)M9; 15.3(3)M10; 15.3(3)M8a; 15.2(1)EY; 15.0(2)EJ; 15.0(2)EJ1; 15.2(1)SY; 15.2(1)SY1; 15.2(1)SY0a; 15.2(1)SY2; 15.2(2)SY; 15.2(1)SY1a; 15.2(2)SY1; 15.2(2)SY2; 15.2(1)SY3; 15.2(1)SY4; 15.2(2)SY3; 15.2(1)SY5; 15.2(1)SY6; 15.2(1)SY7; 15.2(1)SY8; 15.2(5)EX; 15.0(2)EK; 15.0(2)EK1; 15.4(1)CG; 15.4(1)CG1; 15.4(2)CG; 15.5(1)S; 15.5(2)S; 15.5(1)S1; 15.5(3)S; 15.5(1)S2; 15.5(1)S3; 15.5(2)S1; 15.5(2)S2; 15.5(3)S1; 15.5(3)S1a; 15.5(2)S3; 15.5(3)S2; 15.5(3)S0a; 15.5(3)S3; 15.5(1)S4; 15.5(2)S4; 15.5(3)S4; 15.5(3)S5; 15.5(3)S6; 15.5(3)S6a; 15.5(3)S7; 15.5(3)S6b; 15.5(3)S8; 15.5(3)S9; 15.5(3)S10; 15.5(3)S9a; 15.5(1)T; 15.5(1)T1; 15.5(2)T; 15.5(1)T2; 15.5(1)T3; 15.5(2)T1; 15.5(2)T2; 15.5(2)T3; 15.5(2)T4; 15.5(1)T4; 15.2(2)EA; 15.2(2)EA1; 15.2(2)EA2; 15.2(3)EA; 15.2(4)EA; 15.2(4)EA1; 15.2(2)EA3; 15.2(4)EA3; 15.2(5)EA; 15.2(4)EA4; 15.2(4)EA5; 15.2(4)EA6; 15.2(4)EA7; 15.2(4)EA8; 15.2(4)EA9; 15.2(4)EA9a; 15.3(3)JN8; 15.5(3)M; 15.5(3)M1; 15.5(3)M0a; 15.5(3)M2; 15.5(3)M3; 15.5(3)M4; 15.5(3)M4a; 15.5(3)M5; 15.5(3)M6; 15.5(3)M7; 15.5(3)M6a; 15.5(3)M8; 15.5(3)M9; 15.5(3)M10; 15.3(3)JA; 15.3(3)JA1m; 15.3(3)JA1; 15.3(3)JA4; 15.3(3)JA5; 15.3(3)JA6; 15.3(3)JA7; 15.3(3)JA8; 15.3(3)JA10; 15.3(3)JAA; 15.3(3)JAB; 15.3(3)JB; 15.5(3)SN; 15.6(1)S; 15.6(2)S; 15.6(2)S1; 15.6(1)S1; 15.6(1)S2; 15.6(2)S2; 15.6(1)S3; 15.6(2)S3; 15.6(1)S4; 15.6(2)S4; 15.6(1)T; 15.6(2)T; 15.6(1)T0a; 15.6(1)T1; 15.6(2)T1; 15.6(1)T2; 15.6(2)T2; 15.6(1)T3; 15.6(2)T3; 15.3(3)JNB3; 15.3(3)JAX; 15.3(3)JAX1; 15.3(3)JAX2; 15.3(3)JBB; 15.3(3)JBB1; 15.3(3)JBB2; 15.3(3)JBB4; 15.3(3)JBB5; 15.3(3)JBB6; 15.3(3)JC; 15.3(3)JC1; 15.3(3)JC2; 15.3(3)JC3; 15.3(3)JC4; 15.3(3)JC5; 15.3(1)SY; 15.3(1)SY1; 15.3(1)SY2; 15.6(2)SP; 15.6(2)SP1; 15.6(2)SP2; 15.6(2)SP3; 15.6(2)SP4; 15.6(2)SP5; 15.6(2)SP6; 15.6(2)SP7; 15.6(2)SP8; 15.6(2)SP9; 15.6(2)SN; 15.3(3)JD; 15.3(3)JD2; 15.6(3)M; 15.6(3)M1; 15.6(3)M0a; 15.6(3)M1b; 15.6(3)M2; 15.6(3)M2a; 15.6(3)M3; 15.6(3)M3a; 15.6(3)M4; 15.6(3)M5; 15.6(3)M6; 15.6(3)M7; 15.6(3)M6a; 15.6(3)M6b; 15.6(3)M8; 15.6(3)M9; 15.2(4)EC1; 15.2(4)EC2; 15.4(1)SY; 15.4(1)SY1; 15.4(1)SY2; 15.4(1)SY3; 15.4(1)SY4; 15.5(1)SY; 15.5(1)SY1; 15.5(1)SY2; 15.5(1)SY3; 15.5(1)SY4; 15.5(1)SY5; 15.5(1)SY6; 15.5(1)SY7; 15.5(1)SY8; 15.5(1)SY9; 15.5(1)SY10; 15.5(1)SY11; 15.5(1)SY12; 15.5(1)SY13; 15.5(1)SY14; 15.5(1)SY15; 15.5(1)SY16; 15.7(3)M; 15.7(3)M1; 15.7(3)M0a; 15.7(3)M3; 15.7(3)M2; 15.7(3)M4; 15.7(3)M5; 15.7(3)M4a; 15.7(3)M4b; 15.7(3)M6; 15.7(3)M7; 15.7(3)M8; 15.7(3)M9; 15.8(3)M; 15.8(3)M1; 15.8(3)M0a; 15.8(3)M0b; 15.8(3)M2; 15.8(3)M1a; 15.8(3)M3; 15.8(3)M2a; 15.8(3)M4; 15.8(3)M3a; 15.8(3)M3b; 15.8(3)M5; 15.8(3)M6; 15.8(3)M7; 15.8(3)M8; 15.8(3)M9; 15.9(3)M; 15.9(3)M1; 15.9(3)M0a; 15.9(3)M2; 15.9(3)M3; 15.9(3)M2a; 15.9(3)M3a; 15.9(3)M4; 15.9(3)M3b; 15.9(3)M5; 15.9(3)M4a; 15.9(3)M6; 15.9(3)M7; 15.9(3)M6a; 15.9(3)M6b; 15.9(3)M8; 15.9(3)M7a; 15.9(3)M9; 15.9(3)M8b; 15.9(3)M10; 15.9(3)M11; 15.9(3)M12
CiscoCisco Secure Firewall Adaptive Security Appliance (ASA) Software9.8.1; 9.8.1.5; 9.8.1.7; 9.8.2; 9.8.2.8; 9.8.2.14; 9.8.2.15; 9.8.2.17; 9.8.2.20; 9.8.2.24; 9.8.2.26; 9.8.2.28; 9.8.2.33; 9.8.2.35; 9.8.2.38; 9.8.3.8; 9.8.3.11; 9.8.3.14; 9.8.3.16; 9.8.3.18; 9.8.3.21; 9.8.3; 9.8.3.26; 9.8.3.29; 9.8.4; 9.8.4.3; 9.8.4.7; 9.8.4.8; 9.8.4.10; 9.8.4.12; 9.8.4.15; 9.8.4.17; 9.8.2.45; 9.8.4.25; 9.8.4.20; 9.8.4.22; 9.8.4.26; 9.8.4.29; 9.8.4.32; 9.8.4.33; 9.8.4.34; 9.8.4.35; 9.8.4.39; 9.8.4.40; 9.8.4.41; 9.8.4.43; 9.8.4.44; 9.8.4.45; 9.8.4.46; 9.8.4.48; 9.12.1; 9.12.1.2; 9.12.1.3; 9.12.2; 9.12.2.4; 9.12.2.5; 9.12.2.9; 9.12.3; 9.12.3.2; 9.12.3.7; 9.12.4; 9.12.3.12; 9.12.3.9; 9.12.2.1; 9.12.4.2; 9.12.4.4; 9.12.4.7; 9.12.4.10; 9.12.4.13; 9.12.4.8; 9.12.4.18; 9.12.4.24; 9.12.4.26; 9.12.4.29; 9.12.4.30; 9.12.4.35; 9.12.4.37; 9.12.4.38; 9.12.4.39; 9.12.4.40; 9.12.4.41; 9.12.4.47; 9.12.4.48; 9.12.4.50; 9.12.4.52; 9.12.4.54; 9.12.4.55; 9.12.4.56; 9.12.4.58; 9.12.4.62; 9.12.4.65; 9.12.4.67; 9.14.1; 9.14.1.10; 9.14.1.6; 9.14.1.15; 9.14.1.19; 9.14.1.30; 9.14.2; 9.14.2.4; 9.14.2.8; 9.14.2.13; 9.14.2.15; 9.14.3; 9.14.3.1; 9.14.3.9; 9.14.3.11; 9.14.3.13; 9.14.3.18; 9.14.3.15; 9.14.4; 9.14.4.6; 9.14.4.7; 9.14.4.12; 9.14.4.13; 9.14.4.14; 9.14.4.15; 9.14.4.17; 9.14.4.22; 9.14.4.23; 9.14.4.24; 9.16.1; 9.16.1.28; 9.16.2; 9.16.2.3; 9.16.2.7; 9.16.2.11; 9.16.2.13; 9.16.2.14; 9.16.3; 9.16.3.3; 9.16.3.14; 9.16.3.15; 9.16.3.19; 9.16.3.23; 9.16.4; 9.16.4.9; 9.16.4.14; 9.16.4.19; 9.16.4.27; 9.16.4.38; 9.16.4.39; 9.16.4.42; 9.16.4.48; 9.16.4.55; 9.16.4.57; 9.16.4.61; 9.16.4.62; 9.16.4.67; 9.16.4.70; 9.16.4.71; 9.16.4.76; 9.16.4.82; 9.16.4.84; 9.17.1; 9.17.1.7; 9.17.1.9; 9.17.1.10; 9.17.1.11; 9.17.1.13; 9.17.1.15; 9.17.1.20; 9.17.1.30; 9.17.1.33; 9.17.1.39; 9.17.1.45; 9.17.1.46; 9.18.1; 9.18.1.3; 9.18.2; 9.18.2.5; 9.18.2.7; 9.18.2.8; 9.18.3; 9.18.3.39; 9.18.3.46; 9.18.3.53; 9.18.3.55; 9.18.3.56; 9.18.4; 9.18.4.5; 9.18.4.8; 9.18.4.22; 9.18.4.24; 9.18.4.29; 9.18.4.34; 9.18.4.40; 9.18.4.47; 9.18.4.50; 9.18.4.52; 9.18.4.53; 9.18.4.57; 9.18.4.66; 9.18.4.67; 9.18.4.68; 9.19.1; 9.19.1.5; 9.19.1.9; 9.19.1.12; 9.19.1.18; 9.19.1.22; 9.19.1.24; 9.19.1.27; 9.19.1.28; 9.19.1.31; 9.19.1.37; 9.19.1.38; 9.19.1.42; 9.20.1; 9.20.1.5; 9.20.2; 9.20.2.10; 9.20.2.21; 9.20.2.22; 9.20.3; 9.20.3.4; 9.20.3.7; 9.20.3.9; 9.20.3.10; 9.20.3.13; 9.20.3.16; 9.20.3.20; 9.20.4; 9.20.4.7; 9.22.1.1; 9.22.1.3; 9.22.1.2; 9.22.1.6; 9.22.2; 9.22.2.4; 9.22.2.9; 9.23.1; 9.23.1.3; 9.23.1.7; 9.23.1.13
CiscoCisco IOS XE Software3.5.0E; 3.5.1E; 3.5.2E; 3.5.3E; 3.11.1S; 3.11.2S; 3.11.0S; 3.11.3S; 3.11.4S; 3.12.0S; 3.12.1S; 3.12.2S; 3.12.3S; 3.12.0aS; 3.12.4S; 3.13.0S; 3.13.1S; 3.13.2S; 3.13.3S; 3.13.4S; 3.13.5S; 3.13.2aS; 3.13.0aS; 3.13.5aS; 3.13.6S; 3.13.7S; 3.13.6aS; 3.13.7aS; 3.13.8S; 3.13.9S; 3.13.10S; 3.6.0E; 3.6.1E; 3.6.2aE; 3.6.2E; 3.6.3E; 3.6.4E; 3.6.5E; 3.6.6E; 3.6.5aE; 3.6.7E; 3.6.8E; 3.6.7bE; 3.6.9E; 3.6.10E; 3.14.0S; 3.14.1S; 3.14.2S; 3.14.3S; 3.14.4S; 3.15.0S; 3.15.1S; 3.15.2S; 3.15.1cS; 3.15.3S; 3.15.4S; 3.7.0E; 3.7.1E; 3.7.2E; 3.7.3E; 3.7.4E; 3.7.5E; 3.16.0S; 3.16.1S; 3.16.1aS; 3.16.2S; 3.16.2aS; 3.16.0cS; 3.16.3S; 3.16.2bS; 3.16.3aS; 3.16.4S; 3.16.4aS; 3.16.4bS; 3.16.5S; 3.16.4dS; 3.16.6S; 3.16.7S; 3.16.6bS; 3.16.7aS; 3.16.7bS; 3.16.8S; 3.16.9S; 3.16.10S; 3.17.0S; 3.17.1S; 3.17.2S; 3.17.1aS; 3.17.3S; 3.17.4S; 3.8.0E; 3.8.1E; 3.8.2E; 3.8.3E; 3.8.4E; 3.8.5E; 3.8.5aE; 3.8.6E; 3.8.7E; 3.8.8E; 3.8.9E; 3.8.10E; 3.18.0aS; 3.18.0S; 3.18.1S; 3.18.2S; 3.18.3S; 3.18.4S; 3.18.0SP; 3.18.1SP; 3.18.1aSP; 3.18.1bSP; 3.18.1cSP; 3.18.2SP; 3.18.2aSP; 3.18.3SP; 3.18.4SP; 3.18.3aSP; 3.18.3bSP; 3.18.5SP; 3.18.6SP; 3.18.7SP; 3.18.8aSP; 3.18.9SP; 3.9.0E; 3.9.1E; 3.9.2E; 16.6.1; 16.6.2; 16.6.3; 16.6.4; 16.6.5; 16.6.4a; 16.6.5a; 16.6.6; 16.6.7; 16.6.8; 16.6.9; 16.6.10; 16.7.1; 16.7.1a; 16.7.1b; 16.7.2; 16.7.3; 16.7.4; 16.8.1; 16.8.1a; 16.8.1b; 16.8.1s; 16.8.1c; 16.8.1d; 16.8.2; 16.8.1e; 16.8.3; 16.9.1; 16.9.2; 16.9.1a; 16.9.1b; 16.9.1s; 16.9.3; 16.9.4; 16.9.3a; 16.9.5; 16.9.5f; 16.9.6; 16.9.7; 16.9.8; 16.10.1; 16.10.1a; 16.10.1b; 16.10.1s; 16.10.1c; 16.10.1e; 16.10.1d; 16.10.2; 16.10.1f; 16.10.1g; 16.10.3; 3.10.0E; 3.10.1E; 3.10.0cE; 3.10.2E; 3.10.3E; 16.11.1; 16.11.1a; 16.11.1b; 16.11.2; 16.11.1s; 16.12.1; 16.12.1s; 16.12.1a; 16.12.1c; 16.12.1w; 16.12.2; 16.12.1y; 16.12.2a; 16.12.3; 16.12.8; 16.12.2s; 16.12.1x; 16.12.1t; 16.12.4; 16.12.3s; 16.12.3a; 16.12.4a; 16.12.5; 16.12.6; 16.12.1z1; 16.12.5a; 16.12.5b; 16.12.1z2; 16.12.6a; 16.12.7; 16.12.9; 16.12.10; 16.12.10a; 16.12.11; 16.12.12; 16.12.13; 16.12.14; 3.11.0E; 3.11.1E; 3.11.2E; 3.11.3E; 3.11.1aE; 3.11.4E; 3.11.3aE; 3.11.5E; 3.11.6E; 3.11.7E; 3.11.8E; 3.11.9E; 3.11.10E; 3.11.11E; 3.11.12E; 3.11.13E; 17.1.1; 17.1.1a; 17.1.1s; 17.1.1t; 17.1.3; 17.2.1; 17.2.1r; 17.2.1a; 17.2.1v; 17.2.2; 17.2.3; 17.3.1; 17.3.2; 17.3.3; 17.3.1a; 17.3.1w; 17.3.2a; 17.3.1x; 17.3.1z; 17.3.4; 17.3.5; 17.3.4a; 17.3.6; 17.3.4b; 17.3.4c; 17.3.5a; 17.3.5b; 17.3.7; 17.3.8; 17.3.8a; 17.4.1; 17.4.2; 17.4.1a; 17.4.1b; 17.4.2a; 17.5.1; 17.5.1a; 17.6.1; 17.6.2; 17.6.1w; 17.6.1a; 17.6.1x; 17.6.3; 17.6.1y; 17.6.1z; 17.6.3a; 17.6.4; 17.6.1z1; 17.6.5; 17.6.6; 17.6.6a; 17.6.5a; 17.6.7; 17.6.8; 17.6.8a; 17.7.1; 17.7.1a; 17.7.1b; 17.7.2; 17.10.1; 17.10.1a; 17.10.1b; 17.8.1; 17.8.1a; 17.9.1; 17.9.1w; 17.9.2; 17.9.1a; 17.9.1x; 17.9.1y; 17.9.3; 17.9.2a; 17.9.1x1; 17.9.3a; 17.9.4; 17.9.1y1; 17.9.5; 17.9.4a; 17.9.5a; 17.9.5b; 17.9.6; 17.9.6a; 17.9.7; 17.9.5e; 17.9.5f; 17.9.8; 17.9.7a; 17.9.7b; 17.11.1; 17.11.1a; 17.12.1; 17.12.1w; 17.12.1a; 17.12.1x; 17.12.2; 17.12.3; 17.12.2a; 17.12.1y; 17.12.1z; 17.12.4; 17.12.3a; 17.12.1z1; 17.12.1z2; 17.12.4a; 17.12.5; 17.12.4b; 17.12.1z3; 17.12.5a; 17.12.1z4; 17.12.6; 17.12.5b; 17.12.5c; 17.12.6a; 17.12.5d; 17.12.6b; 17.13.1; 17.13.1a; 17.14.1; 17.14.1a; 17.15.1; 17.15.1w; 17.15.1a; 17.15.2; 17.15.1b; 17.15.1x; 17.15.1z; 17.15.3; 17.15.2c; 17.15.2a; 17.15.1y; 17.15.2b; 17.15.3a; 17.15.4; 17.15.3b; 17.15.4d; 17.15.4e; 17.16.1; 17.16.1a; 17.17.1; 17.18.1; 17.18.1w; 17.18.1a
CiscoCisco Secure Firewall Threat Defense (FTD) Software6.2.3; 6.2.3.1; 6.2.3.2; 6.2.3.3; 6.2.3.4; 6.2.3.5; 6.2.3.6; 6.2.3.7; 6.2.3.8; 6.2.3.10; 6.2.3.11; 6.2.3.9; 6.2.3.12; 6.2.3.13; 6.2.3.14; 6.2.3.15; 6.2.3.16; 6.2.3.17; 6.2.3.18; 6.6.0; 6.6.0.1; 6.6.1; 6.6.3; 6.6.4; 6.6.5; 6.6.5.1; 6.6.5.2; 6.6.7; 6.6.7.1; 6.6.7.2; 6.4.0; 6.4.0.1; 6.4.0.3; 6.4.0.2; 6.4.0.4; 6.4.0.5; 6.4.0.6; 6.4.0.7; 6.4.0.8; 6.4.0.9; 6.4.0.10; 6.4.0.11; 6.4.0.12; 6.4.0.13; 6.4.0.14; 6.4.0.15; 6.4.0.16; 6.4.0.17; 6.4.0.18; 7.0.0; 7.0.0.1; 7.0.1; 7.0.1.1; 7.0.2; 7.0.2.1; 7.0.3; 7.0.4; 7.0.5; 7.0.6; 7.0.6.1; 7.0.6.2; 7.0.6.3; 7.0.7; 7.0.8; 7.0.8.1; 7.1.0; 7.1.0.1; 7.1.0.2; 7.1.0.3; 7.2.0; 7.2.0.1; 7.2.1; 7.2.2; 7.2.3; 7.2.4; 7.2.4.1; 7.2.5; 7.2.5.1; 7.2.6; 7.2.7; 7.2.5.2; 7.2.8; 7.2.8.1; 7.2.9; 7.2.10; 7.2.10.2; 7.3.0; 7.3.1; 7.3.1.1; 7.3.1.2; 7.4.0; 7.4.1; 7.4.1.1; 7.4.2; 7.4.2.1; 7.4.2.2; 7.4.2.3; 7.4.2.4; 7.6.0; 7.6.1; 7.6.2; 7.6.2.1; 7.7.0; 7.7.10; 7.7.10.1

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-20012?
A vulnerability in the Internet Key Exchange version 2 (IKEv2) feature of Cisco IOS Software, Cisco IOS XE Software, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a memory leak, resulting in a denial of service (DoS) condition on an affected device. This vulnerability is due to improper parsing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. A successful exploit of Cisco IOS Software and IOS XE Software could allow the attacker to cause the affected device to reload, resulting in a DoS condition. A successful exploit of Cisco Secure Firewall ASA Software and Secure FTD Software could allow the attacker to partially exhaust system memory, resulting in system instability, such as the inability to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover from this condition.
How severe is CVE-2026-20012?
CVE-2026-20012 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20012?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST