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Vulnerability record · public intelligence
CVE-2021-29457
UNKNOWN

Heap buffer overflow in Exiv2::Jp2Image::doWriteMetadata

Published Apr 19, 2021 · Updated Nov 3, 2026

Severity · CVSSUNKNOWN · Not scored
Known exploitationNot listed
EPSS / likelihood2.15%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

Heap buffer overflow in Exiv2::Jp2Image::doWriteMetadata

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

Exiv2 is a command-line utility and C++ library for reading, writing, deleting, and modifying the metadata of image files. A heap buffer overflow was found in Exiv2 versions v0.27.3 and earlier. The heap overflow is triggered when Exiv2 is used to write metadata into a crafted image file. An attacker could potentially exploit the vulnerability to gain code execution, if they can trick the victim into running Exiv2 on a crafted image file. Note that this bug is only triggered when _writing_ the metadata, which is a less frequently used Exiv2 operation than _reading_ the metadata. For example, to trigger the bug in the Exiv2 command-line application, you need to add an extra command-line argument such as `insert`. The bug is fixed in version v0.27.4.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
MEDIUM
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. GitHub advisory ↗
  2. Security advisory ↗
  3. Source repository ↗
  4. FEDORA-2021-10d7331a31 ↗
  5. FEDORA-2021-be94728b95 ↗
  6. DSA-4958 ↗
  7. [debian-lts-announce] 20210830 [SECURITY] [DLA 2750-1] exiv2 security update ↗
  8. GLSA-202312-06 ↗

Record history

Published Apr 19, 2021 · Last refreshed Nov 3, 2026

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