Vulnerability · Published Dec 22, 2025 · Assigned by VulnCheck

CVE-2025-34457wb2osz/direwolf <= 1.8.1 Stack-based Buffer Overflow DoS

High 8.7

In plain English

A high-severity stack buffer overflow in Dire Wolf from wb2osz. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.5%top 56.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

wb2osz/direwolf (Dire Wolf) versions up to and including 1.8.1, 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	direwolf	no fix listed	DEBIAN-CVE-2025-34457
Debian:13	direwolf	1.7+dfsg-2+deb13u1	DEBIAN-CVE-2025-34457
Debian:14	direwolf	1.8.1+dfsg-2	DEBIAN-CVE-2025-34457
Ubuntu:22.04:LTS	direwolf	no fix listed	UBUNTU-CVE-2025-34457
Ubuntu:24.04:LTS	direwolf	no fix listed	UBUNTU-CVE-2025-34457
Ubuntu:25.10	direwolf	no fix listed	UBUNTU-CVE-2025-34457
Ubuntu:26.04:LTS	direwolf	no fix listed	UBUNTU-CVE-2025-34457
Ubuntu:26.10	direwolf	no fix listed	UBUNTU-CVE-2025-34457

Affected products (as reported)

Vendor	Product	Versions
wb2osz	Dire Wolf	0 – through 1.8.1

Weakness: CWE-121 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

https://github.com/marlinkcyber/advisories/blob/main/advisories/MCSAID-2025-010-direwolf-stack-buffer-overflow-kiss-frame.md technical-description, exploit
https://github.com/wb2osz/direwolf/issues/617 issue-tracking
https://github.com/wb2osz/direwolf/commit/694c954 patch
https://www.vulncheck.com/advisories/wb2osz-direwolf-stack-based-buffer-overflow-dos third-party-advisory