Security readout for executives and security teams
Plain-English summary
CVE-2021-34334 can make Exiv2 hang when it reads metadata from a specially crafted image. The main business impact is denial of service: affected image-processing workflows may stall or consume resources until interrupted. It requires user interaction or a workflow that processes an attacker-supplied file.
Executive priority
Treat this as a moderate availability risk. Prioritize upgrades where Exiv2 handles customer, partner, or internet-sourced images, especially in automated processing paths where a hang could disrupt services or queues.
Technical view
Exiv2 versions through 0.27.4 contain an infinite-loop flaw tied to an integer-overflow loop counter when parsing crafted image metadata. The CVSS 3.1 score is 5.5, with local attack vector, required user interaction, no confidentiality or integrity impact, and high availability impact. The issue is fixed in v0.27.5.
Likely exposure
Exposure is most likely on systems running Exiv2 CLI or library versions <= 0.27.4 that process untrusted or externally supplied image files, including automated metadata extraction pipelines and desktop workflows.
Exploitation context
The source bundle does not show known active exploitation, and KEV is false. Exploitation requires getting a victim or processing workflow to run Exiv2 against a crafted image file, causing a denial-of-service condition rather than data theft or code execution.
Researcher notes
Focus validation on versioning, package backports, and data-flow exposure to untrusted images. The public description supports denial of service via infinite loop only; it does not support claims of remote code execution, data compromise, or active exploitation.
Mitigation direction
- Upgrade Exiv2 to v0.27.5 or a vendor-fixed distribution package.
- Apply relevant Fedora, Debian LTS, Gentoo, or other OS security updates.
- Restrict Exiv2 processing of untrusted images until upgraded.
- Use operational timeouts for image metadata jobs where practical.
Validation and detection
- Inventory Exiv2 CLI and linked library versions across endpoints and servers.
- Confirm affected systems are not running Exiv2 <= 0.27.4.
- Identify workflows that parse user-supplied image metadata with Exiv2.
- Verify vendor package changelogs reference CVE-2021-34334 or the Exiv2 fix.
- Confirm denial-of-service monitoring covers stalled image-processing jobs.
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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Open ATT&CK lookupCVE-2021-34334 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H1.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/Exiv2/exiv2/security/advisories/GHSA-hqjh-hpv8-8r9pCVE reference
- https://github.com/Exiv2/exiv2/pull/1766CVE reference
- FEDORA-2021-399f869889CVE reference · vendor-advisory
- FEDORA-2021-cbaef8e2d5CVE reference · vendor-advisory
- [debian-lts-announce] 20230110 [SECURITY] [DLA 3265-1] exiv2 security updateCVE reference · mailing-list
- GLSA-202312-06CVE reference · vendor-advisory
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.
Loop with Unreachable Exit Condition ('Infinite Loop')
Loop with Unreachable Exit Condition ('Infinite Loop') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.