CVE-2025-8735Public exploit

Local crash via lexer null pointer dereference

Published Aug 8, 2025 · Updated Oct 28, 2025

Null pointer dereference in GNU cflow 1.0 through 1.8 allows local users to crash the utility with a crafted C source file. The public record identifies yylex in c.c as the dereference locus but does not disclose which lexer operation produces the null pointer. Exploitation requires local execution of cflow against attacker-controlled input, and the documented consequence is limited to interruption of that process.

CVSS severity3.3
Low
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Null pointer dereference in GNU cflow 1.0 through 1.8 allows local users to crash the utility with a crafted C source file. The public record identifies yylex in c.c as the dereference locus but does not disclose which lexer operation produces the null pointer. Exploitation requires local execution of cflow against attacker-controlled input, and the documented consequence is limited to interruption of that process.

The record

CVE
CVE-2025-8735
Published
Aug 8, 2025
Updated
Oct 28, 2025
Vendor
The GnuPG Project
Product
GNU cflow
Classifications
CWE-476, CWE-404
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1.0
  2. Affected versionversion=1.1
  3. Affected versionversion=1.2
  4. Affected versionversion=1.3
  5. Affected versionversion=1.4
  6. Affected versionversion=1.5
  7. Affected versionversion=1.6
  8. Affected versionversion=1.7
  9. Affected versionversion=1.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The GnuPG Project · GNU cflowversion=1.0; version=1.1; version=1.2; version=1.3; version=1.4; version=1.5; version=1.6; version=1.7; version=1.8

Published CVSS scores

3.3UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.8VulDB CNACVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CWE-404Improper Resource Shutdown or Release

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo