How severe is CVE-2024-20311?

CVE-2024-20311 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2024-20311 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-20311?

CVE-2024-20311 primarily affects Cisco Ios. In total, 708 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-20311?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-20311 have an EU (EUVD) identifier?

Yes. CVE-2024-20311 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18026.

When was CVE-2024-20311 published?

CVE-2024-20311 was published on 2024-03-27 and last updated on 2026-06-17.

CVE-2024-20311

CVE-2024-20311 is a high-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-674.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-18026
Weakness: CWE-674
Affected product: Cisco Ios
Published: 2024-03-27
Last modified: 2026-06-17

Description

A vulnerability in the Locator ID Separation Protocol (LISP) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. This vulnerability is due to the incorrect handling of LISP packets. An attacker could exploit this vulnerability by sending a crafted LISP packet to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition. Note: This vulnerability could be exploited over either IPv4 or IPv6 transport.

Frequently asked questions

What is CVE-2024-20311?: A vulnerability in the Locator ID Separation Protocol (LISP) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. This vulnerability is due to the incorrect handling of LISP packets. An attacker could exploit this vulnerability by sending a crafted LISP packet to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition. Note: This vulnerability could be exploited over either IPv4 or IPv6 transport.
How severe is CVE-2024-20311?: CVE-2024-20311 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2024-20311 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-20311?: CVE-2024-20311 primarily affects Cisco Ios. In total, 708 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-20311?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-20311 have an EU (EUVD) identifier?: Yes. CVE-2024-20311 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18026.
When was CVE-2024-20311 published?: CVE-2024-20311 was published on 2024-03-27 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lisp-3gYXs3qP

Affected products (708)

cpe:2.3:o:cisco:ios:15.1\(1\)sy:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)sy6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(1\)xb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy4a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy10:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy11:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy12:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy13:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy14:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy15:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(2\)sy16:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)mra:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)mra1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)mra2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)mra3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)mra4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)s0a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)s3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1\(3\)s4:*:*:*:*:*:*:*

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