CVE-2020-35631Network attack vector

Code execution via unchecked face-cycle index

Published Apr 18, 2022 · Updated Apr 23, 2025

Out-of-bounds read in CGAL 5.1.1 allows remote attackers to execute code by supplying a malformed Nef polygon file. SNC_io_parser::read_sface() passes an unchecked file-supplied index into SEdge_of before SD.link_as_face_cycle dereferences the selected object. Exploitation requires a consuming application to parse the crafted file and runs code with that application's privileges.

CVSS severity10.0
Critical
EPSS probability2.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in CGAL 5.1.1 allows remote attackers to execute code by supplying a malformed Nef polygon file. SNC_io_parser::read_sface() passes an unchecked file-supplied index into SEdge_of before SD.link_as_face_cycle dereferences the selected object. Exploitation requires a consuming application to parse the crafted file and runs code with that application's privileges.

The record

CVE
CVE-2020-35631
Published
Apr 18, 2022
Updated
Apr 23, 2025
Vendor
CGAL Project
Product
CGAL
Classifications
CWE-129
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=CGAL-5.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CGAL Project · CGALversion=CGAL-5.1.1

Published CVSS scores

10.0Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-129Improper Validation of Array Index

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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