CVE-2025-8845Public exploit

Memory corruption via assemble_file stack overflow

Published Aug 11, 2025 · Updated Aug 12, 2025

Stack-based buffer overflow in NASM 2.17rc0 allows local users to corrupt process memory via crafted assembly input. The public record identifies assemble_file in nasm.c but does not disclose the input field, copy operation, or missing bounds check that overruns the stack buffer. A low-privileged local account is required, and the available evidence does not establish whether exploitation exceeds a NASM process crash.

CVSS severity7.8
High
EPSS probability0.27%
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 NASM 2.17rc0 allows local users to corrupt process memory via crafted assembly input. The public record identifies assemble_file in nasm.c but does not disclose the input field, copy operation, or missing bounds check that overruns the stack buffer. A low-privileged local account is required, and the available evidence does not establish whether exploitation exceeds a NASM process crash.

The record

CVE
CVE-2025-8845
Published
Aug 11, 2025
Updated
Aug 12, 2025
Vendor
NASM
Product
NASM
Classifications
CWE-121, CWE-119
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=2.17rc0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

NASM · NASMversion=2.17rc0

Published CVSS scores

4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P
1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

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

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