Security readout for executives and security teams
Plain-English summary
CVE-2020-21684 is a denial-of-service issue in fig2dev 3.2.7b. A crafted xfig file can trigger a global buffer overflow when converted to pict2e format, potentially crashing the conversion process. Business risk is highest where document conversion is automated or accepts files from untrusted users.
Executive priority
Prioritize remediation for internet-facing or automated conversion services. For internal-only desktop use, urgency is lower but still worth addressing during routine package maintenance because malformed files can interrupt processing.
Technical view
The flaw is reported in put_font within genpict2e.c in fig2dev 3.2.7b. The documented trigger is conversion of an xfig file into pict2e format. The public bundle describes denial of service only; it does not provide CVSS, CWE, CPEs, fixed versions, or evidence of code execution.
Likely exposure
Exposure is most likely on systems, CI jobs, publishing pipelines, or web services that run fig2dev 3.2.7b against user-supplied or externally sourced xfig files, especially when producing pict2e output.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. The stated attack condition is processing a malicious or malformed xfig file through the vulnerable pict2e conversion path. Impact is described as denial of service.
Researcher notes
Evidence is sparse. Treat the affected scope narrowly as fig2dev 3.2.7b and the xfig-to-pict2e path. The bundle does not identify a patch, affected CPEs, exploit availability, or root-cause details beyond the named global buffer overflow location.
Mitigation direction
- Avoid processing untrusted xfig files with fig2dev 3.2.7b.
- Check upstream or distribution guidance for a fixed fig2dev release.
- Isolate document conversion workers from critical services.
- Restrict upload and conversion paths to trusted users where possible.
- Apply resource limits and restart supervision around conversion jobs.
Validation and detection
- Inventory hosts and containers that include fig2dev.
- Confirm whether version 3.2.7b is present.
- Identify workflows converting xfig files to pict2e output.
- Review upload, CI, and publishing pipelines for untrusted xfig input.
- Check logs for repeated fig2dev crashes during pict2e conversion.
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-2020-21684 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://sourceforge.net/p/mcj/tickets/75/CVE 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.