7.8

CVE-2023-20236: cisco cisco ios xr software

CVSS: 7.8v3.1HighModified
Published 13-09-2023Last modified 16-12-2025
Open JSON

Vulnerability summary

CVE-2023-20236 is a high (CVSS 7.8) vulnerability in cisco cisco ios xr software. EPSS estimates a 0.10% chance of exploitation in the next 30 days, higher than 0.8% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.10%
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. 16-12-2025
    Last modifiedVulnerability information updated.

Description

A vulnerability in the iPXE boot function of Cisco IOS XR software could allow an authenticated, local attacker to install an unverified software image on an affected device. This vulnerability is due to insufficient image verification. An attacker could exploit this vulnerability by manipulating the boot parameters for image verification during the iPXE boot process on an affected device. A successful exploit could allow the attacker to boot an unverified software image on the affected device.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.10%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

0.00 pp

From 0.10% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.10%

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 | 5.2.47 | 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 | 7.6.1 | 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
  • ios_xr< 7.10.1

1 vendor · 2 products

References

1 links