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CVE Record

CVE-2021-45910: An issue was discovered in gif2apng 1.9.

An issue was discovered in gif2apng 1.9. There is a heap-based buffer overflow within the main function. It allows an attacker to write data outside of the allocated buffer. The attacker has control over a part of the address that data is written to, control over the written data, and (to some extent) control over the amount of data that is written.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-45910 is a memory corruption flaw in gif2apng 1.9. A specially crafted GIF could cause the tool to write outside allocated memory. The business risk depends on whether gif2apng processes untrusted images, such as uploads or automated conversion queues.

Executive priority

Treat this as high priority if gif2apng handles external image files. If gif2apng is absent or only used on trusted internal assets, urgency is lower but inventory should confirm that assumption.

Technical view

The CVE describes a heap-based buffer overflow in gif2apng 1.9 within main. The attacker can influence the destination address partly, the written data, and the write size to some extent. Public metadata does not provide CVSS, CWE, or complete affected package ranges.

Likely exposure

Exposure is most likely on servers, build jobs, or desktop workflows that run gif2apng 1.9 against externally supplied GIF files. The provided CVE data lists affected vendor and product as n/a, so inventory must confirm actual package names and versions locally.

Exploitation context

The sources do not claim active exploitation, and CISA KEV status is false. The vulnerability requires gif2apng to parse attacker-controlled input. The described attacker control over write target and data makes it operationally serious where untrusted image conversion is automated.

Researcher notes

Evidence is limited to the CVE description and Debian security references. No CVSS score, CWE entry, complete affected CPEs, exploit-in-the-wild evidence, or detailed upstream fix information is included in the supplied bundle.

Mitigation direction

  • Identify all hosts and pipelines using gif2apng.
  • Apply the relevant vendor or distribution security update.
  • Prioritize systems converting user-supplied or internet-sourced GIFs.
  • Avoid processing untrusted GIFs with gif2apng until updated.
  • Review Debian DLA guidance if using Debian-packaged gif2apng.

Validation and detection

  • Check installed gif2apng versions across servers and build images.
  • Confirm patched packages are deployed from the relevant distribution.
  • Find services or jobs invoking gif2apng on uploaded files.
  • Verify image conversion workloads run with limited privileges.
  • Document any remaining unpatched exposure and compensating controls.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2021-45910 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.