How severe is CVE-2024-20304?

CVE-2024-20304 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-2024-20304 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-20304?

CVE-2024-20304 primarily affects Cisco Ios Xr. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-20304?

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-2024-20304 have an EU (EUVD) identifier?

Yes. CVE-2024-20304 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18019.

When was CVE-2024-20304 published?

CVE-2024-20304 was published on 2024-09-11 and last updated on 2026-06-17.

CVE-2024-20304

CVE-2024-20304 is a high-severity vulnerability in Cisco Ios Xr 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-401.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-18019
Weakness: CWE-401
Affected product: Cisco Ios Xr
Published: 2024-09-11
Last modified: 2026-06-17

Description

A vulnerability in the multicast traceroute version 2 (Mtrace2) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to exhaust the UDP packet memory of an affected device. This vulnerability exists because the Mtrace2 code does not properly handle packet memory. An attacker could exploit this vulnerability by sending crafted packets to an affected device. A successful exploit could allow the attacker to exhaust the incoming UDP packet memory. The affected device would not be able to process higher-level UDP-based protocols packets, possibly causing a denial of service (DoS) condition. Note: This vulnerability can be exploited using IPv4 or IPv6.

Frequently asked questions

What is CVE-2024-20304?: A vulnerability in the multicast traceroute version 2 (Mtrace2) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to exhaust the UDP packet memory of an affected device. This vulnerability exists because the Mtrace2 code does not properly handle packet memory. An attacker could exploit this vulnerability by sending crafted packets to an affected device. A successful exploit could allow the attacker to exhaust the incoming UDP packet memory. The affected device would not be able to process higher-level UDP-based protocols packets, possibly causing a denial of service (DoS) condition. Note: This vulnerability can be exploited using IPv4 or IPv6.
How severe is CVE-2024-20304?: CVE-2024-20304 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-2024-20304 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-20304?: CVE-2024-20304 primarily affects Cisco Ios Xr. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-20304?: 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-2024-20304 have an EU (EUVD) identifier?: Yes. CVE-2024-20304 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-18019.
When was CVE-2024-20304 published?: CVE-2024-20304 was published on 2024-09-11 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-pak-mem-exhst-3ke9FeFy

Affected products (18)

cpe:2.3:o:cisco:ios_xr:7.7.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.7.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.7.21:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.8.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.8.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.8.12:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.8.22:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.9.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.9.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.9.21:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.10.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.10.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.11.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:7.11.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.1.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.1.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.2.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:24.2.11:*:*:*:*:*:*:*

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