PT-2025-52719 · Wb2Osz+1 · Dire Wolf+1

Vlatko Kosturjak · Published 2025-12-22 · Updated 2026-01-02 · CVE-2025-34457

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions wb2osz/direwolf (Dire Wolf) versions up to and including 1.8, prior to commit 694c954

Description The software contains a stack-based buffer overflow issue in the kiss rec byte() function, found in src/kiss frame.c. Processing specially crafted KISS frames reaching the maximum allowed frame length (MAX KISS LEN) causes the function to append a terminating FEND byte without allocating enough space in the stack buffer. This leads to an out-of-bounds write and subsequent out-of-bounds read during the call to kiss unwrap(), resulting in stack memory corruption or application crashes. This may allow remote, unauthenticated attackers to cause a denial-of-service condition.

Recommendations Update wb2osz/direwolf (Dire Wolf) to a version later than 1.8 and including commit 694c954.

Exploit

Fix

DoS

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2025-34457

Affected Products

Debian

Dire Wolf

References · 15

• 🔥 https://github.com/marlinkcyber/advisories/blob/main/advisories/MCSAID-2025-010-direwolf-stack-buffer-overflow-kiss-frame.md · Exploit
• https://github.com/wb2osz/direwolf/commit/694c954 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-34457 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-34457 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-34457 · Security Note
• https://cve.org/CVERecord?id=CVE-2025-34457 · Security Note
• https://ubuntu.com/security/CVE-2025-34457 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-34457 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-34457 · Vendor Advisory
• https://github.com/wb2osz/direwolf/issues/617 · Note
• https://twitter.com/VulmonFeeds/status/2003262750462513554 · Twitter Post
• https://twitter.com/CVEnew/status/2003233961427030141 · Twitter Post
• https://vulncheck.com/advisories/wb2osz-direwolf-stack-based-buffer-overflow-dos · Note
• https://t.me/CVEtracker/40450 · Telegram Post
• https://twitter.com/Cezar_H_Linux/status/2007148180379664656 · Twitter Post