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CVE-2018-10243: htp_parse_authorization_digest in htp_parsers.c in LibHTP 0.5.26 allows remote attackers to cause a heap-ba...

htp_parse_authorization_digest in htp_parsers.c in LibHTP 0.5.26 allows remote attackers to cause a heap-based buffer over-read via an authorization digest header.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2018-10243 is a LibHTP parsing flaw involving HTTP Authorization Digest headers. A remote sender could trigger a heap-based buffer over-read in LibHTP 0.5.26. The main business concern is reliability of systems that inspect HTTP traffic, especially Suricata deployments using affected LibHTP code.

Executive priority

Treat this as a maintenance-priority security update for traffic inspection infrastructure. It is not supported as actively exploited by the supplied sources, but affected sensors can sit on critical network paths, so unresolved exposure can create operational risk.

Technical view

The issue is in htp_parse_authorization_digest in htp_parsers.c. The source description identifies LibHTP 0.5.26 and a heap-based buffer over-read reachable through an Authorization Digest header. Public references point to Suricata 4.0.5 and a Debian LTS Suricata security update, but the bundle does not provide CVSS, CWE, CPE, or full affected-version detail.

Likely exposure

Exposure is most likely where Suricata or other HTTP-inspection tooling embeds or links affected LibHTP 0.5.26. The provided affected-product metadata is incomplete, so confirm package versions and bundled LibHTP versions rather than assuming only one product is affected.

Exploitation context

The source states remote attackers can trigger the over-read with an Authorization Digest header. There is no KEV listing in the bundle and no cited source here claims active exploitation, public weaponization, or exploitation in the wild.

Researcher notes

The public bundle is sparse: no CVSS vector, CWE, CPE, exploit status, or complete affected-version matrix is provided. The strongest facts are the vulnerable LibHTP function, version 0.5.26, remote header-triggered heap over-read, and Suricata-related update references.

Mitigation direction

  • Review vendor guidance for LibHTP and Suricata security updates.
  • Upgrade Suricata packages covered by the 4.0.5 or Debian LTS security updates where applicable.
  • Inventory systems using LibHTP 0.5.26 directly or through bundled dependencies.
  • Prioritize internet-facing or high-volume HTTP inspection sensors.
  • Monitor vendor advisories for affected-version and fix confirmation.

Validation and detection

  • Check installed Suricata package versions against vendor security advisories.
  • Confirm whether each deployment uses LibHTP 0.5.26.
  • Review package changelogs for CVE-2018-10243 or LibHTP parser fixes.
  • Verify HTTP inspection services remain stable after update testing.
  • Document any deployments where affected-version evidence is inconclusive.
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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CVE-2018-10243 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
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

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.