What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-22 · updated 2026-10-29
• Weakness: CWE-121

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 products

• wb2osz Dire Wolf: through 1.8.1

References

• 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

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