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CVE-2021-40117

HIGHCVSS 7.5/10EPSS 1.48%

Last modified

CVE-2021-40117 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in SSL/TLS message handler for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because incoming SSL/TLS packets are not properly processed. EPSS estimates a 1.48% chance of exploitation in the next 30 days.

Description

A vulnerability in SSL/TLS message handler for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because incoming SSL/TLS packets are not properly processed. An attacker could exploit this vulnerability by sending a crafted SSL/TLS packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
1.48%

70.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance< 9.8.4.40
CiscoFirepower Threat Defense< 6.2.3.17
CiscoFirepower Threat Defense>= 6.3.0, < 6.4.0.13
CiscoFirepower Threat Defense>= 6.5.0, < 6.6.5
CiscoFirepower Threat Defense>= 6.7.0, < 6.7.0.3
CiscoFirepower Threat Defense>= 7.0.0, < 7.0.1
CiscoAdaptive Security Appliance Software>= 9.9.0, < 9.12.4.26
CiscoAdaptive Security Appliance Software>= 9.13.0, < 9.14.3.9
CiscoAdaptive Security Appliance Software>= 9.15.0, < 9.15.1.17
CiscoAdaptive Security Appliance Software>= 9.16.0, < 9.16.2.3
CiscoAsa 5512-X Firmware009.009\(002.085\)
CiscoAsa 5512-X Firmware009.014\(002.106\)
CiscoAsa 5505 Firmware009.009\(002.085\)
CiscoAsa 5505 Firmware009.014\(002.106\)
CiscoAsa 5515-X Firmware009.009\(002.085\)
CiscoAsa 5515-X Firmware009.014\(002.106\)
CiscoAsa 5525-X Firmware009.009\(002.085\)
CiscoAsa 5525-X Firmware009.014\(002.106\)
CiscoAsa 5545-X Firmware009.009\(002.085\)
CiscoAsa 5545-X Firmware009.014\(002.106\)
CiscoAsa 5555-X Firmware009.009\(002.085\)
CiscoAsa 5555-X Firmware009.014\(002.106\)
CiscoAsa 5580 Firmware009.009\(002.085\)
CiscoAsa 5580 Firmware009.014\(002.106\)
CiscoAsa 5585-X Firmware009.009\(002.085\)
CiscoAsa 5585-X Firmware009.014\(002.106\)

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-40117?
A vulnerability in SSL/TLS message handler for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because incoming SSL/TLS packets are not properly processed. An attacker could exploit this vulnerability by sending a crafted SSL/TLS packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
How severe is CVE-2021-40117?
CVE-2021-40117 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.48% probability of exploitation in the next 30 days.
How do I fix CVE-2021-40117?
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.

Are you affected by CVE-2021-40117?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST