How severe is CVE-2024-20267?

CVE-2024-20267 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-2024-20267 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-20267?

CVE-2024-20267 primarily affects Cisco Nx-os. In total, 205 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-20267?

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-2024-20267 have an EU (EUVD) identifier?

Yes. CVE-2024-20267 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-17982.

When was CVE-2024-20267 published?

CVE-2024-20267 was published on 2024-02-29 and last updated on 2026-06-17.

CVE-2024-20267

CVE-2024-20267 is a high-severity vulnerability in Cisco Nx-os 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-120.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-17982
Weakness: CWE-120
Affected product: Cisco Nx-os
Published: 2024-02-29
Last modified: 2026-06-17

Description

A vulnerability with the handling of MPLS traffic for Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause the netstack process to unexpectedly restart, which could cause the device to stop processing network traffic or to reload. This vulnerability is due to lack of proper error checking when processing an ingress MPLS frame. An attacker could exploit this vulnerability by sending a crafted IPv6 packet that is encapsulated within an MPLS frame to an MPLS-enabled interface of the targeted device. A successful exploit could allow the attacker to cause a denial of service (DoS) condition. Note: The IPv6 packet can be generated multiple hops away from the targeted device and then encapsulated within MPLS. The DoS condition may occur when the NX-OS device processes the packet.

Frequently asked questions

What is CVE-2024-20267?: A vulnerability with the handling of MPLS traffic for Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause the netstack process to unexpectedly restart, which could cause the device to stop processing network traffic or to reload. This vulnerability is due to lack of proper error checking when processing an ingress MPLS frame. An attacker could exploit this vulnerability by sending a crafted IPv6 packet that is encapsulated within an MPLS frame to an MPLS-enabled interface of the targeted device. A successful exploit could allow the attacker to cause a denial of service (DoS) condition. Note: The IPv6 packet can be generated multiple hops away from the targeted device and then encapsulated within MPLS. The DoS condition may occur when the NX-OS device processes the packet.
How severe is CVE-2024-20267?: CVE-2024-20267 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-2024-20267 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-20267?: CVE-2024-20267 primarily affects Cisco Nx-os. In total, 205 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-20267?: 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-2024-20267 have an EU (EUVD) identifier?: Yes. CVE-2024-20267 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-17982.
When was CVE-2024-20267 published?: CVE-2024-20267 was published on 2024-02-29 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipv6-mpls-dos-R9ycXkwM

Affected products (205)

cpe:2.3:o:cisco:nx-os:6.0\(2\)a3\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a3\(2\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a3\(4\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a4\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a4\(2\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a4\(3\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a4\(4\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a4\(5\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a4\(6\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(2\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(2a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(3\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(3a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(4\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(4a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(5\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(5a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(5b\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(6\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(7\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a6\(8\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a7\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a7\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a7\(2\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a7\(2a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(2\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(3\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(4\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(4a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(5\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(6\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(7\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(7a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(7b\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(8\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(9\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)a8\(10\):*:*:*:*:*:*:*

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