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CVE-2021-1251

HIGHCVSS 7.4/10EPSS 0.43%

Last modified

CVE-2021-1251 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. Multiple vulnerabilities exist in the Link Layer Discovery Protocol (LLDP) implementation for Cisco Small Business RV Series Routers. An unauthenticated, adjacent attacker could execute arbitrary code or cause an affected router to leak system memory or reload. EPSS estimates a 0.43% chance of exploitation in the next 30 days.

Description

Multiple vulnerabilities exist in the Link Layer Discovery Protocol (LLDP) implementation for Cisco Small Business RV Series Routers. An unauthenticated, adjacent attacker could execute arbitrary code or cause an affected router to leak system memory or reload. A memory leak or device reload would cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory. Note: LLDP is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).

Metrics

CVSS 3.1
7.4/10

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

EPSS Probability
0.43%

34.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoRv132w Firmware1.0.1.14
CiscoRv132w Firmware1.0.3.20
CiscoRv134w Firmware1.0.1.14
CiscoRv134w Firmware1.0.3.20
CiscoRv160 Firmware1.0.1.14
CiscoRv160 Firmware1.0.3.20
CiscoRv160w Firmware1.0.1.14
CiscoRv160w Firmware1.0.3.20
CiscoRv260 Firmware1.0.1.14
CiscoRv260 Firmware1.0.3.20
CiscoRv260p Firmware1.0.1.14
CiscoRv260p Firmware1.0.3.20
CiscoRv260w Firmware1.0.1.14
CiscoRv260w Firmware1.0.3.20
CiscoRv340 Firmware1.0.1.14
CiscoRv340 Firmware1.0.3.20
CiscoRv340w Firmware1.0.1.14
CiscoRv340w Firmware1.0.3.20
CiscoRv345 Firmware1.0.1.14
CiscoRv345 Firmware1.0.3.20
CiscoRv345p Firmware1.0.1.14
CiscoRv345p Firmware1.0.3.20

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-1251?
Multiple vulnerabilities exist in the Link Layer Discovery Protocol (LLDP) implementation for Cisco Small Business RV Series Routers. An unauthenticated, adjacent attacker could execute arbitrary code or cause an affected router to leak system memory or reload. A memory leak or device reload would cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory. Note: LLDP is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).
How severe is CVE-2021-1251?
CVE-2021-1251 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1251?
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-2021-1251?

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

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Source: NVD / NIST