Security readout for executives and security teams
Plain-English summary
CVE-2021-33462 is a reported use-after-free flaw in Yasm 1.3.0. Business risk is most relevant where Yasm processes untrusted or third-party assembly input, such as build systems. The public record does not provide CVSS, affected CPEs, a vendor fix, or evidence of active exploitation.
Executive priority
Track as a targeted build-tool exposure, not a confirmed emergency. Escalate if Yasm 1.3.0 handles untrusted inputs in production build pipelines or if maintainers publish a confirmed fix or stronger impact details.
Technical view
The CVE describes a use-after-free in expr_traverse_nodes_post() in libyasm/expr.c in Yasm 1.3.0. Available sources identify the vulnerable code area but do not document impact, reachability, crash behavior, privilege context, or fixed versions. Treat exposure as input-processing risk until vendor or maintainer guidance clarifies remediation.
Likely exposure
Exposure appears limited to environments running Yasm 1.3.0. Priority should be higher for CI, packaging, developer workstations, or automated build services that parse assembly files from external or low-trust sources.
Exploitation context
The source bundle references a GitHub issue and public gist, but does not cite CISA KEV inclusion or active exploitation. Evidence is insufficient to claim in-the-wild exploitation, weaponization, or reliable impact beyond the reported memory-safety issue.
Researcher notes
Current public data is sparse: no CVSS, CWE mapping, affected CPEs, fixed release, or exploitation confirmation are included. The strongest source-grounded statement is a use-after-free in libyasm/expr.c affecting Yasm 1.3.0.
Mitigation direction
- Inventory systems and build images for Yasm 1.3.0.
- Check Yasm maintainer guidance for fixed versions or recommended workarounds.
- Avoid processing untrusted assembly inputs with vulnerable Yasm builds.
- Constrain CI jobs that invoke Yasm using least privilege and isolation.
- Monitor package sources for updated Yasm builds or downstream backports.
Validation and detection
- Confirm installed Yasm versions across CI, build hosts, and developer images.
- Review build pipelines for jobs that invoke Yasm on external source trees.
- Check whether dependency lockfiles or containers pin Yasm 1.3.0.
- Review the referenced GitHub issue for maintainer updates before remediation decisions.
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-2021-33462 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://github.com/yasm/yasm/issues/165CVE reference · x_refsource_MISC
- https://gist.github.com/Clingto/bb632c0c463f4b2c97e4f65f751c5e6dCVE 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.