Buffer overflow in Nasm Netwide Assember
CVE-2025-8843
A vulnerability was found in NASM Netwide Assember 2.17rc0. This affects the function macho_no_dead_strip of the file outmacho.c. The manipulation leads to heap-based buffer overflow. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (15.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Nasm Netwide Assember — versions 2.17rc0
- Nasm Netwide Assembler — versions 2.17
Weakness classification (CWE)
Public proof-of-concept exploits
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (Exploit, VDB Entry, Third Party Advisory, third-party-advisory)
- vuldb.com/ (Exploit, VDB Entry, Third Party Advisory, third-party-advisory)
- bugzilla.nasm.us/show_bug.cgi (issue-tracking, Exploit, Issue Tracking, Vendor Advisory)
- drive.google.com/file/d/1JRHWdjW6FGHDV0CMJe8VinmCQ4vP9ZpR/view (Exploit, exploit)
Frequently asked questions
- What is CVE-2025-8843?
- CVE-2025-8843 is a medium-severity vulnerability in Nasm Netwide Assember, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2025-08-11.
- How severe is CVE-2025-8843?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2025-8843 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.