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CVE Record

CVE-2021-31292: An integer overflow in CrwMap::encode0x1810 of Exiv2 0.27.3 allows attackers to trigger a heap-based buffer...

An integer overflow in CrwMap::encode0x1810 of Exiv2 0.27.3 allows attackers to trigger a heap-based buffer overflow and cause a denial of service (DOS) via crafted metadata.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-31292 is a denial-of-service flaw in Exiv2 0.27.3, a library used to read and write image metadata. A specially crafted metadata file can trigger memory corruption and crash the process handling it. Business urgency depends on whether internet-facing or automated workflows process untrusted images or metadata.

Executive priority

Handle as a moderate operational reliability risk. Prioritize patching where image metadata processing is exposed to external users or automated ingestion, because a crafted file could disrupt affected services. Lack of KEV or CVSS data limits evidence for emergency escalation.

Technical view

The CVE describes an integer overflow in CrwMap::encode0x1810 in Exiv2 0.27.3, leading to a heap-based buffer overflow and denial of service through crafted metadata. The source bundle does not provide CVSS, CWE, confirmed code execution, or active exploitation evidence.

Likely exposure

Exposure is most likely in applications, services, containers, or desktop tools that include Exiv2 0.27.3 or vulnerable distro packages and process externally supplied image metadata. Systems that do not parse untrusted image metadata have lower practical exposure.

Exploitation context

The provided sources support crafted metadata causing denial of service. They do not show CISA KEV listing, active exploitation, public weaponization status, or confirmed remote code execution. Treat exploitability as input-dependent and impact as service disruption unless vendor guidance says otherwise.

Researcher notes

Key evidence is the CVE description and Exiv2 issue reference, supported by multiple Linux distribution advisories. The bundle names Exiv2 0.27.3 and denial of service, but does not provide scoring, exploit maturity, affected CPEs, or a complete upstream fixed-version statement.

Mitigation direction

  • Update Exiv2 using the applicable Debian, Fedora, Gentoo, or vendor security advisory.
  • Upgrade bundled Exiv2 0.27.3 components through the application or upstream maintainer.
  • Prioritize systems that process uploaded, emailed, or otherwise untrusted image metadata.
  • If patch status is unclear, check the vendor package advisory before accepting residual risk.

Validation and detection

  • Inventory installed Exiv2 packages and embedded libexiv2 copies across hosts, containers, and applications.
  • Flag Exiv2 0.27.3 and vulnerable distro builds for remediation review.
  • Confirm patched package versions against the relevant Debian, Fedora, Gentoo, or vendor advisory.
  • Review crash logs for metadata-processing failures in Exiv2-dependent services.
Prepared
Confidence
medium
Sources
8

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

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-2021-31292 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
7Source 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.