5.3

CVE-2024-20266: cisco cisco ios xr software NULL Pointer Dereference

CVSS: 5.3v3.1MediumDeferred
Published 13-03-2024Last modified 14-08-2024
Open JSON

Vulnerability summary

CVE-2024-20266 is a medium (CVSS 5.3) NULL Pointer Dereference vulnerability in cisco cisco ios xr software. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 49.6% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.64%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 13-03-2024
    PublishedVulnerability first disclosed.
  2. 14-08-2024
    Last modifiedVulnerability information updated.

Description

A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition. This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a crash of the dhcpd process. While the dhcpd process is restarting, which may take approximately two minutes, DHCPv4 server services are unavailable on the affected device. This could temporarily prevent network access to clients that join the network during that time period and rely on the DHCPv4 server of the affected device. Notes: Only the dhcpd process crashes and eventually restarts automatically. The router does not reload. This vulnerability only applies to DHCPv4. DHCP version 6 (DHCPv6) is not affected.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.64%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

0.00 pp

From 0.64% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.64%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco1 product
  • cisco ios xr software5.2.0 | 5.2.1 | 5.2.2 | 5.2.4 | 5.2.3 | 5.2.5 | 5.2.47 | 5.3.0 | 5.3.1 | 5.3.2 | 5.3.3 | 5.3.4 | 6.0.0 | 6.0.1 | 6.0.2 | 6.1.1 | 6.1.2 | 6.1.3 | 6.1.4 | 6.1.12 | 6.1.22 | 6.1.32 | 6.1.36 | 6.1.42 | 6.2.1 | 6.2.2 | 6.2.3 | 6.2.25 | 6.2.11 | 6.3.2 | 6.3.3 | 6.3.15 | 6.4.1 | 6.4.2 | 6.4.3 | 6.5.1 | 6.5.2 | 6.5.3 | 6.5.25 | 6.5.26 | 6.5.28 | 6.5.29 | 6.5.32 | 6.5.33 | 6.6.2 | 6.6.3 | 6.6.25 | 6.6.4 | 7.0.1 | 7.0.2 | 7.0.12 | 7.0.14 | 7.1.1 | 7.1.15 | 7.1.2 | 7.1.3 | 6.7.1 | 6.7.2 | 6.7.3 | 6.7.4 | 7.2.0 | 7.2.1 | 7.2.2 | 7.3.1 | 7.3.15 | 7.3.2 | 7.3.3 | 7.3.5 | 7.4.1 | 7.4.2 | 6.8.1 | 6.8.2 | 7.5.1 | 7.5.3 | 7.5.2 | 7.5.4 | 7.5.5 | 7.6.1 | 7.6.2 | 7.7.1 | 7.7.2 | 7.7.21 | 6.9.1 | 6.9.2 | 7.8.1 | 7.8.2 | 7.9.1 | 7.9.2 | 7.9.21 | 7.10.1 | 7.10.2

1 vendor · 1 product

References

1 links