---
id: CVE-2025-34457
title: wb2osz/direwolf <= 1.8.1 Stack-based Buffer Overflow DoS
summary: >-
  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…
severity: high
cvss: 8.7
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-121
vendor: wb2osz
product: direwolf
affected:
  - direwolf <= 1.8.1
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2025-12-22T21:53:46.294245Z'
published: '2025-12-22'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T21:15:15.325Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-34457'
references:
  - url: >-
      https://github.com/marlinkcyber/advisories/blob/main/advisories/MCSAID-2025-010-direwolf-stack-buffer-overflow-kiss-frame.md
  - url: 'https://github.com/wb2osz/direwolf/issues/617'
  - url: 'https://github.com/wb2osz/direwolf/commit/694c954'
  - url: >-
      https://www.vulncheck.com/advisories/wb2osz-direwolf-stack-based-buffer-overflow-dos
tags:
  - cve.org
epss: 0.00509
epssPercentile: 0.43434
ingestedAt: '2026-11-03T08:39:35.537Z'
---

## Overview

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

- `direwolf <= 1.8.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.