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CVE-2021-34121

HIGH
7.8
CVSS Score
Published: July 18, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 03:55 AM UTC
2 products affected across 2 vendorsProject HtmldocProject Htmldoc

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Severity
HIGH7.8
Exploit prediction
EPSS 0.3%
SSVC
PoC

Description

An Out of Bounds flaw was discovered in htmodoc 1.9.12 in function parse_tree() in toc.cxx, this possibly leads to memory layout information leaking in the data. This might be used in a chain of vulnerability in order to reach code execution.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Patch
Source: [email protected]
https://github.com/michaelrsweet/htmldoc/commit/c67bbd8756f015e33e4ba639a40c7f9d8bd9e8ab
ExploitIssue Tracking
Source: [email protected]
https://github.com/michaelrsweet/htmldoc/issues/433

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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