Security readout for executives and security teams
Plain-English summary
This CVE describes a memory safety bug in NASM 2.14rc16 that can crash the assembler. Business impact is most likely build or analysis disruption, not direct data theft, based on the provided sources. The public record does not provide a CVSS score, complete affected-product metadata, or a named fixed version.
Executive priority
Prioritize this where NASM is used in automated builds handling untrusted code. For typical internal-only build environments, urgency appears lower, but incomplete severity and fix data warrant inventory and vendor-status confirmation.
Technical view
The CVE reports a use-after-free in NASM at asm/preproc.c, function pp_getline. The stated outcome is denial of service during certain tests. The record names NASM 2.14rc16, but the structured affected fields are incomplete and list n/a.
Likely exposure
Exposure is most plausible where NASM 2.14rc16 is installed in developer workstations, CI pipelines, build containers, or code-analysis workflows. Risk increases if those systems assemble untrusted or externally submitted assembly inputs.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. It also does not describe remote exploitation. Treat this as a crash risk when NASM processes triggering input, with details incomplete.
Researcher notes
Key gaps are missing CVSS, missing CWE, incomplete affected metadata, and no named fixed version in the provided bundle. Focus analysis on NASM 2.14rc16 preprocessing behavior and practical denial-of-service exposure in build pipelines.
Mitigation direction
- Inventory developer, CI, and build environments for NASM 2.14rc16.
- Check NASM Bugzilla and release notes for vendor-confirmed remediation guidance.
- Avoid processing untrusted assembly inputs with NASM 2.14rc16.
- Run NASM in isolated build containers for untrusted code workflows.
- Monitor vendor and CVE records because the provided fix data is incomplete.
Validation and detection
- Confirm the NASM version installed in build images and developer tooling.
- Review CI jobs for assembly input from external contributors or automation.
- Check whether NASM crashes are appearing in build or test logs.
- Verify vendor guidance before upgrading or changing build tooling.
- Retest affected builds after any NASM version change.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-20538 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.nasm.us/show_bug.cgi?id=3392531CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.