CVE-2020-25860

Severity: medium (CVSS 6.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-12-21 · updated 2026-06-17
Weakness: CWE-367

Description

The install.c module in the Pengutronix RAUC update client prior to version 1.5 has a Time-of-Check Time-of-Use vulnerability, where signature verification on an update file takes place before the file is reopened for installation. An attacker who can modify the update file just before it is reopened can install arbitrary code on the device.

Affected products

rauc: before 1.5 — fixed in 1.5

How to fix

Upgrade to a fixed version: rauc 1.5. Check the vendor advisory for mitigations.

References

https://github.com/rauc/rauc/security/advisories/GHSA-cgf3-h62j-w9vv
https://www.vdoo.com/blog/cve-2020-25860-significant-vulnerability-discovered-rauc-embedded-firmware-update-framework
https://github.com/rauc/rauc/security/advisories/GHSA-cgf3-h62j-w9vv
https://www.vdoo.com/blog/cve-2020-25860-significant-vulnerability-discovered-rauc-embedded-firmware-update-framework

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