CVE-2025-34457Public exploitNetwork attack vector

Unauthenticated service crash via KISS frame terminator

Published Dec 22, 2025 · Updated Dec 22, 2025

Stack-based buffer overflow in Dire Wolf 1.8.1 and earlier allows remote attackers to crash the service via a maximum-length KISS frame. In kiss_rec_byte(), the frame collector accepts MAX_KISS_LEN bytes and then appends FEND without space, after which kiss_unwrap() reads beyond the stack array. The KISS TCP service must accept the crafted frame; no authentication or user interaction is required, and the demonstrated consequence is a process crash.

CVSS severity8.7
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Dire Wolf 1.8.1 and earlier allows remote attackers to crash the service via a maximum-length KISS frame. In kiss_rec_byte(), the frame collector accepts MAX_KISS_LEN bytes and then appends FEND without space, after which kiss_unwrap() reads beyond the stack array. The KISS TCP service must accept the crafted frame; no authentication or user interaction is required, and the demonstrated consequence is a process crash.

The record

CVE
CVE-2025-34457
Published
Dec 22, 2025
Updated
Dec 22, 2025
Vendor
wb2osz
Product
Dire Wolf
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

wb2osz · Dire Wolfversion=0 <=1.8

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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