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CVE Record

CVE-2018-6612: An integer underflow bug in the process_EXIF function of the exif.c file of jhead 3.00 raises a heap-based...

An integer underflow bug in the process_EXIF function of the exif.c file of jhead 3.00 raises a heap-based buffer over-read when processing a malicious JPEG file, which may allow a remote attacker to cause a denial-of-service attack or unspecified other impact.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2018-6612 is a flaw in jhead 3.00 when it reads EXIF data from JPEG files. A malicious JPEG can trigger a heap buffer over-read, potentially crashing the process. Business risk is highest where jhead processes files from users, partners, or automated ingestion pipelines.

Executive priority

Treat as a targeted remediation item for image-processing environments, not a broad emergency. Prioritize quickly if customer-uploaded or partner-supplied JPEGs are processed automatically, because exploitation could disrupt services that depend on metadata extraction.

Technical view

The CVE describes an integer underflow in process_EXIF in exif.c in jhead 3.00. The underflow can cause a heap-based buffer over-read while parsing a crafted JPEG. The public record names denial of service and unspecified other impact, but does not provide CVSS, CWE, or detailed affected-package metadata.

Likely exposure

Exposure is likely limited to systems using jhead 3.00 or distro packages derived from it to process untrusted JPEG images. Internet exposure depends on whether jhead is reachable through upload, metadata extraction, or media-processing workflows.

Exploitation context

The source bundle does not show CISA KEV listing or other evidence of active exploitation. The described attack path requires a malicious JPEG to be processed by vulnerable jhead code. Public evidence here supports denial of service; other impact is unspecified.

Researcher notes

The public CVE data is sparse: no CVSS, CWE, detailed CPEs, or confirmed fix statement are present in the supplied bundle. The strongest technical facts are jhead 3.00, process_EXIF in exif.c, integer underflow, heap over-read, malicious JPEG trigger, and denial-of-service potential.

Mitigation direction

  • Inventory systems and pipelines that invoke jhead for JPEG metadata processing.
  • Check Debian, Ubuntu, and vendor package guidance for fixed jhead builds.
  • Upgrade or replace vulnerable jhead 3.00 packages where vendor updates are available.
  • Restrict untrusted JPEG processing until package status is confirmed.
  • Run image-processing jobs with least privilege and resource limits.

Validation and detection

  • Confirm installed jhead versions across servers, containers, and build images.
  • Review upload and media workflows for calls to jhead.
  • Check Debian bug 889272 and Ubuntu jhead package status for remediation details.
  • Verify package manager metadata against vendor advisories before closure.
  • Confirm untrusted JPEG inputs cannot directly crash critical services.
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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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

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