CVE-2020-35634Public exploitNetwork attack vector

Code execution via unchecked Nef array index

Published Aug 30, 2021 · Updated Apr 23, 2025

Out-of-bounds read in CGAL 5.1.1 Nef polygon parsing allows attackers to execute code through a crafted malformed file. SNC_io_parser::read_sface() uses an unvalidated file-supplied index to access SLoop_of and stores the resulting object in an sface boundary list. Applications that parse hostile Nef data expose the flaw; successful exploitation causes type confusion and code execution in the consuming process.

CVSS severity10.0
Critical
EPSS probability2.38%
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 Nef polygon parsing allows attackers to execute code through a crafted malformed file. SNC_io_parser::read_sface() uses an unvalidated file-supplied index to access SLoop_of and stores the resulting object in an sface boundary list. Applications that parse hostile Nef data expose the flaw; successful exploitation causes type confusion and code execution in the consuming process.

The record

CVE
CVE-2020-35634
Published
Aug 30, 2021
Updated
Apr 23, 2025
Vendor
CGAL Project
Product
CGAL
Classifications
CWE-129, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 30, 2021CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=CGAL Project libcgal CGAL-5.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CGAL Project · CGALversion=CGAL Project libcgal CGAL-5.1.1

Published CVSS scores

7.0NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
10.0Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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