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Fencer Vulns
medium 6.6

CVE-2020-25860 json

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 signat…

published 2020-12-21 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-18493

cvss
6.6
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

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.

Patch / fix

  • pengutronix rauc 1.5
  • rauc Debian 14, Debian 13, Debian 12 1.5-1

debian advisories DEBIAN-CVE-2020-25860

Exploit prediction

1.45% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/rauc/rauc/security/advisories/GHSA-cgf3-h62j-w9vv referenced PoC, tagged "exploit" by a source, unverified
  • vdoo.com https://www.vdoo.com/blog/cve-2020-25860-significant-vulnerability-discovered-rauc-embedded-firmware-update-framework referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.6 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.1 AV:N/AC:H/Au:S/C:C/I:C/A:C

Affected products

  • n/a Pengutronix RAUC

Classification

Weakness
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.