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CVE Record

CVE-2020-36277: Leptonica before 1.80.0 allows a denial of service (application crash) via an incorrect left shift in pixCo...

Leptonica before 1.80.0 allows a denial of service (application crash) via an incorrect left shift in pixConvert2To8 in pixconv.c.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-36277 is a Leptonica image-processing flaw that can crash an application using vulnerable versions before 1.80.0. The known impact is denial of service, not data theft or code execution. Business urgency depends on whether exposed services process untrusted images.

Executive priority

Treat as a targeted availability risk. Prioritize internet-facing or customer-facing image-processing workloads first, then remediate internal batch or desktop use through normal patch cycles.

Technical view

The issue is an incorrect left shift in pixConvert2To8 in pixconv.c in Leptonica before 1.80.0. The source bundle ties it to application crash behavior and references OSS-Fuzz plus upstream and Linux distribution updates. No CVSS, CWE, or detailed affected product CPEs are provided.

Likely exposure

Exposure is most likely in applications, services, or Linux packages that embed or link Leptonica/leptonlib before 1.80.0 and process attacker-supplied or otherwise untrusted image files.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation. OSS-Fuzz and vendor advisories indicate the bug was publicly identified and remediated, but exploit-in-the-wild evidence is not provided.

Researcher notes

Evidence is concise: vulnerable version boundary, function name, and crash impact are known, but CVSS, CWE, exploit status, and affected CPEs are absent. Avoid assuming broader impact beyond denial of service.

Mitigation direction

  • Inventory Leptonica or leptonlib usage across applications and base images.
  • Upgrade Leptonica to 1.80.0 or a vendor-patched package.
  • Apply relevant Debian, Fedora, or Gentoo security updates where applicable.
  • Limit untrusted image processing until vulnerable deployments are remediated.
  • Monitor image-processing services for unexplained crashes or availability degradation.

Validation and detection

  • Confirm deployed Leptonica or leptonlib versions are not earlier than 1.80.0.
  • Check SBOMs, package manifests, and container images for vulnerable library versions.
  • Verify vendor security updates are applied on affected Linux distributions.
  • Identify services that process externally supplied images using Leptonica.
  • Review recent crash telemetry for image-conversion failure patterns.
Prepared
Confidence
medium
Sources
9

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
8Source 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.