Security readout for executives and security teams
Plain-English summary
CVE-2020-18974 describes a buffer overflow in Netwide Assembler 2.15.xx that can crash the tool, causing denial of service. The evidence provided does not show remote code execution, active exploitation, or a confirmed fixed version.
Executive priority
Treat this as a targeted build-tool availability risk, not a confirmed broad enterprise emergency. Prioritize teams that compile third-party or untrusted assembly code using NASM 2.15.xx.
Technical view
The reported flaw is a buffer overflow in NASM's nasmlib/crc64 component, associated with crc64i handling. The CVE states it is distinct from CVE-2019-7147. No CVSS vector, CWE, CPE, exploit status, or remediation details are included in the supplied bundle.
Likely exposure
Exposure is most plausible in build, CI, packaging, or research environments that run NASM 2.15.xx against untrusted or externally supplied assembly inputs. Internet-facing production services are not directly indicated by the provided sources.
Exploitation context
The supplied sources support denial of service only. There is no KEV listing and no cited evidence of active exploitation. The required attacker position is not fully documented beyond influencing NASM input that reaches the affected crc64i path.
Researcher notes
The record is sparse: affected data is listed as n/a, while the description names NASM 2.15.xx. Severity and remediation are not specified. Avoid broad claims beyond denial of service unless vendor details provide more evidence.
Mitigation direction
- Inventory NASM versions across developer workstations, CI runners, and build images.
- Check NASM vendor or bug tracker guidance for fixed releases or workarounds.
- Avoid processing untrusted assembly inputs with NASM 2.15.xx.
- Isolate CI jobs that assemble third-party inputs from critical build infrastructure.
- Monitor build systems for unexplained NASM crashes or repeated assembly failures.
Validation and detection
- Confirm whether any environment runs NASM 2.15.xx.
- Review CI and packaging workflows for externally supplied assembly sources.
- Check whether builds use crc64i-related NASM functionality.
- Review the NASM Bugzilla reference for vendor-confirmed status.
- Document whether the vulnerability is applicable or not applicable per environment.
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
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CVE-2020-18974 mapping review
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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=3392568CVE 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.