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CVE-2021-1398

MEDIUMCVSS 6.8/10EPSS 0.38%

Last modified

CVE-2021-1398 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
6.8/10

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.38%

29.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos Xe3.7.0bs
CiscoIos Xe3.7.0s
CiscoIos Xe3.7.0xas
CiscoIos Xe3.7.0xbs
CiscoIos Xe3.7.1as
CiscoIos Xe3.7.1s
CiscoIos Xe3.7.2s
CiscoIos Xe3.7.2ts
CiscoIos Xe3.7.3s
CiscoIos Xe3.7.4as
CiscoIos Xe3.7.4s
CiscoIos Xe3.7.5s
CiscoIos Xe3.7.6s
CiscoIos Xe3.7.7s
CiscoIos Xe3.7.8s
CiscoIos Xe3.8.0s
CiscoIos Xe3.8.1s
CiscoIos Xe3.8.2s
CiscoIos Xe3.9.0as
CiscoIos Xe3.9.0s
CiscoIos Xe3.9.0xas
CiscoIos Xe3.9.1as
CiscoIos Xe3.9.1s
CiscoIos Xe3.9.2s
CiscoIos Xe3.10.0s
CiscoIos Xe3.10.1s
CiscoIos Xe3.10.1xbs
CiscoIos Xe3.10.1xcs
CiscoIos Xe3.10.2as
CiscoIos Xe3.10.2s
CiscoIos Xe3.10.2ts
CiscoIos Xe3.10.3s
CiscoIos Xe3.10.4s
CiscoIos Xe3.10.5s
CiscoIos Xe3.10.6s
CiscoIos Xe3.10.7s
CiscoIos Xe3.10.8as
CiscoIos Xe3.10.8s
CiscoIos Xe3.10.9s
CiscoIos Xe3.10.10s
CiscoIos Xe3.11.0s
CiscoIos Xe3.11.1s
CiscoIos Xe3.11.2s
CiscoIos Xe3.11.3s
CiscoIos Xe3.11.4s
CiscoIos Xe3.12.0as
CiscoIos Xe3.12.0s
CiscoIos Xe3.12.1s
CiscoIos Xe3.12.2s
CiscoIos Xe3.12.3s

Showing 50 of 257 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-1398?
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.
How severe is CVE-2021-1398?
CVE-2021-1398 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1398?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1398?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST