Stack-based Buffer Overflow Affecting direwolf package, versions <1.8.1+dfsg-2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-DIREWOLF-14559941
- published24 Dec 2025
- disclosed22 Dec 2025
Introduced: 22 Dec 2025
CVE-2025-34457 (opens in a new tab)How to fix?
Upgrade Debian:unstable direwolf to version 1.8.1+dfsg-2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream direwolf package and not the direwolf package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
wb2osz/direwolf (Dire Wolf) versions up to and including 1.8, prior to commit 694c954, contain a stack-based buffer overflow vulnerability in the function kiss_rec_byte() located in src/kiss_frame.c. When processing crafted KISS frames that reach the maximum allowed frame length (MAX_KISS_LEN), the function appends a terminating FEND byte without reserving sufficient space in the stack buffer. This results in an out-of-bounds write followed by an out-of-bounds read during the subsequent call to kiss_unwrap(), leading to stack memory corruption or application crashes. This vulnerability may allow remote unauthenticated attackers to trigger a denial-of-service condition.
References
- https://security-tracker.debian.org/tracker/CVE-2025-34457
- https://github.com/marlinkcyber/advisories/blob/main/advisories/MCSAID-2025-010-direwolf-stack-buffer-overflow-kiss-frame.md
- https://github.com/wb2osz/direwolf/commit/694c954
- https://github.com/wb2osz/direwolf/issues/617
- https://www.vulncheck.com/advisories/wb2osz-direwolf-stack-based-buffer-overflow-dos