6.5

CVE-2023-20233: cisco cisco ios xr software NULL Pointer Dereference

CVSS: 6.5v3.1MediumModified
Published 13-09-2023Last modified 02-08-2024
Open JSON

Vulnerability summary

CVE-2023-20233 is a medium (CVSS 6.5) NULL Pointer Dereference vulnerability in cisco cisco ios xr software. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 26.1% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.34%
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. 13-09-2023
    PublishedVulnerability first disclosed.
  2. 02-08-2024
    Last modifiedVulnerability information updated.

Description

A vulnerability in the Connectivity Fault Management (CFM) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to incorrect processing of invalid continuity check messages (CCMs). An attacker could exploit this vulnerability by sending crafted CCMs to an affected device. A successful exploit could allow the attacker to cause the CFM service to crash when a user displays information about maintenance end points (MEPs) for peer MEPs on an affected device.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

26%

Versus all other CVEs

30-day change

0.00 pp

From 0.34% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.34%

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

Cisco2 products
  • cisco ios xr software5.2.0 | 5.2.1 | 5.2.2 | 5.2.4 | 5.2.3 | 5.2.5 | 5.3.0 | 5.3.1 | 5.3.2 | 5.3.3 | 5.3.4 | 6.1.1 | 6.1.2 | 6.1.3 | 6.1.4 | 6.2.1 | 6.2.2 | 6.2.3 | 6.2.25 | 6.3.2 | 6.3.3 | 6.3.15 | 6.4.1 | 6.4.2 | 6.4.3 | 6.5.1 | 6.5.2 | 6.6.2 | 6.6.3 | 6.6.25 | 6.6.4 | 7.0.1 | 7.0.2 | 7.1.1 | 7.1.15 | 7.1.2 | 7.1.3 | 6.7.1 | 6.7.2 | 6.7.3 | 6.7.4 | 7.2.1 | 7.2.2 | 7.3.1 | 7.3.2 | 7.3.3 | 7.4.1 | 7.4.2 | 6.8.1 | 6.8.2 | 7.5.1 | 7.5.3 | 7.5.2 | 7.6.1 | 7.6.2 | 7.7.1 | 7.7.2 | 6.9.1 | 6.9.2
  • ios_xr< 7.5.4 | ≥ 7.6, < 7.6.3 | ≥ 7.7, < 7.7.21 | ≥ 7.8, < 7.8.2 | 7.9.0

1 vendor · 2 products

References

1 links