How severe is CVE-2025-34457?

CVE-2025-34457 has a CVSS 4.0 base score of 8.7, rated high severity.

Is CVE-2025-34457 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-34457?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-34457 have an EU (EUVD) identifier?

Yes. CVE-2025-34457 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204760.

When was CVE-2025-34457 published?

CVE-2025-34457 was published on 2025-12-22 and last updated on 2026-06-17.

CVE-2025-34457

CVE-2025-34457 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: High (CVSS 4.0 base score 8.7)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-204760
Weakness: CWE-121
Published: 2025-12-22
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-34457?: 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.
How severe is CVE-2025-34457?: CVE-2025-34457 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2025-34457 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-34457?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-34457 have an EU (EUVD) identifier?: Yes. CVE-2025-34457 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204760.
When was CVE-2025-34457 published?: CVE-2025-34457 was published on 2025-12-22 and last updated on 2026-06-17.

References

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