6.9

CVE-2021-1398: cisco cisco ios xe software Active Debug Code

CVSS: 6.9v2.0MediumModified
Published 24-03-2021Last modified 08-11-2024
Open JSON

Vulnerability summary

CVE-2021-1398 is a medium (CVSS 6.9) Active Debug Code vulnerability in cisco cisco ios xe software. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.8% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v2.0 (NVD)
EPSS score
0.39%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 24-03-2021
    PublishedVulnerability first disclosed.
  2. 08-11-2024
    Last modifiedVulnerability information updated.

Description

A vulnerability in the boot logic of Cisco IOS XE Software could allow an authenticated, local attacker with level 15 privileges or an unauthenticated attacker with physical access to execute arbitrary code on the underlying Linux operating system of an affected device. This vulnerability is due to incorrect validations of specific function arguments that are passed to the boot script. An attacker could exploit this vulnerability by tampering with a specific file, which an affected device would process during the initial boot process. On systems that are protected by the Unified Extensible Firmware Interface (UEFI) secure boot feature, a successful exploit could allow the attacker to execute unsigned code at boot time and bypass the image verification check in the secure boot process of the affected device.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.39%

Chance of exploitation in the next 30 days

Percentile

32%

Versus all other CVEs

30-day change

+0.01 pp

From 0.38% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.39%

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 xe softwaren/a
  • ios_xe3.7.0bs | 3.7.0s | 3.7.0xas | 3.7.0xbs | 3.7.1as | 3.7.1s | 3.7.2s | 3.7.2ts | 3.7.3s | 3.7.4as | 3.7.4s | 3.7.5s | 3.7.6s | 3.7.7s | 3.7.8s | 3.8.0s | 3.8.1s | 3.8.2s | 3.9.0as | 3.9.0s | 3.9.0xas | 3.9.1as | 3.9.1s | 3.9.2s | 3.10.0s | 3.10.1s | 3.10.1xbs | 3.10.1xcs | 3.10.2as | 3.10.2s | 3.10.2ts | 3.10.3s | 3.10.4s | 3.10.5s | 3.10.6s | 3.10.7s | 3.10.8as | 3.10.8s | 3.10.9s | 3.10.10s | 3.11.0s | 3.11.1s | 3.11.2s | 3.11.3s | 3.11.4s | 3.12.0as | 3.12.0s | 3.12.1s | 3.12.2s | 3.12.3s | 3.12.4s | 3.13.0as | 3.13.0s | 3.13.1s | 3.13.2as | 3.13.2s | 3.13.3s | 3.13.4s | 3.13.5as | 3.13.5s | 3.13.6as | 3.13.6bs | 3.13.6s | 3.13.7as | 3.13.7s | 3.13.8s | 3.13.9s | 3.13.10s | 3.14.0s | 3.14.1s | 3.14.2s | 3.14.3s | 3.14.4s | 3.15.0s | 3.15.1cs | 3.15.1s | 3.15.1xbs | 3.15.2s | 3.15.2xbs | 3.15.3s | 3.15.4s | 3.16.0as | 3.16.0bs | 3.16.0cs | 3.16.0s | 3.16.1as | 3.16.1s | 3.16.2as | 3.16.2bs | 3.16.2s | 3.16.3as | 3.16.3s | 3.16.4as | 3.16.4bs | 3.16.4cs | 3.16.4ds | 3.16.4es | 3.16.4gs | 3.16.4s | 3.16.5as | 3.16.5bs | 3.16.5s | 3.16.6bs | 3.16.6s | 3.16.7as | 3.16.7bs | 3.16.7s | 3.16.8s | 3.16.9s | 3.16.10as | 3.16.10s | 3.17.0s | 3.17.1as | 3.17.1s | 3.17.2s | 3.17.3s | 3.17.4s | 3.18.0as | 3.18.0s | 3.18.0sp | 3.18.1asp | 3.18.1bsp | 3.18.1csp | 3.18.1gsp | 3.18.1hsp | 3.18.1isp | 3.18.1s | 3.18.1sp | 3.18.2asp | 3.18.2s | 3.18.2sp | 3.18.3asp | 3.18.3bsp | 3.18.3s | 3.18.3sp | 3.18.4s | 3.18.4sp | 3.18.5sp | 3.18.6sp | 3.18.7sp | 3.18.8asp | 3.18.8sp | 16.1.1 | 16.1.2 | 16.1.3 | 16.2.1 | 16.2.2 | 16.3.1 | 16.3.1a | 16.3.2 | 16.3.3 | 16.3.4 | 16.3.5 | 16.3.5b | 16.3.6 | 16.3.7 | 16.3.8 | 16.3.9 | 16.3.10 | 16.4.1 | 16.4.2 | 16.4.3 | 16.5.1 | 16.5.1a | 16.5.1b | 16.5.2 | 16.5.3 | 16.6.1 | 16.6.2 | 16.6.3 | 16.6.4 | 16.6.4a | 16.6.4s | 16.6.5 | 16.6.5a | 16.6.5b | 16.6.6 | 16.6.7 | 16.6.7a | 16.6.8 | 16.7.1 | 16.7.1a | 16.7.1b | 16.7.2 | 16.7.3 | 16.7.4 | 16.8.1 | 16.8.1a | 16.8.1b | 16.8.1c | 16.8.1d | 16.8.1e | 16.8.1s | 16.8.2 | 16.8.3 | 16.9.1 | 16.9.1a | 16.9.1b | 16.9.1c | 16.9.1d | 16.9.1s | 16.9.2 | 16.9.2a | 16.9.2s | 16.9.3 | 16.9.3a | 16.9.3h | 16.9.3s | 16.9.4 | 16.9.4c | 16.9.5 | 16.9.5f | 16.10.1 | 16.10.1a | 16.10.1b | 16.10.1c | 16.10.1d | 16.10.1e | 16.10.1f | 16.10.1g | 16.10.1s | 16.10.2 | 16.10.3 | 16.11.1 | 16.11.1a | 16.11.1b | 16.11.1c | 16.11.1s | 16.11.2 | 16.12.1 | 16.12.1a | 16.12.1c | 16.12.1s | 16.12.1t | 16.12.1w | 16.12.1x | 16.12.1y | 16.12.1z | 16.12.1za | 16.12.2 | 16.12.2a | 16.12.2s | 16.12.2t | 16.12.3 | 16.12.3a | 16.12.3s | 16.12.4 | 16.12.4a | 17.1.1 | 17.1.1a | 17.1.1s | 17.1.1t | 17.1.2 | 17.2.1 | 17.2.1a | 17.2.1r | 17.2.1v

1 vendor · 2 products

References

1 links