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Vulnerability record · CVE-2020-25860 · published 21 December 2020

CVE-2020-25860: Pengutronix rauc toctou race condition vulnerability

Pengutronix · Rauc

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.

6.6 CVSS 3.1 Medium EPSS 1.4% · top 28.0% CWE-367 · TOCTOU race condition
6.6CVSS 3.1 base score, v2 7.1
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-25860), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.