CVE-2020-28623Network attack vector

Code execution via unchecked facet index

Published Apr 18, 2022 · Updated Apr 23, 2025

Out-of-bounds read in CGAL 5.1.1 Nef_S2 polygon parsing allows attackers to execute code through a crafted polygon file. The SNC_io_parser::read_facet() method reads an untrusted facet index and uses it directly in Halffacet_of[index] to set fh->twin() without a bounds check. Any application that passes attacker-controlled Nef_S2 data to the affected parser exposes its process to invalid object assignment, type confusion, and code execution.

CVSS severity10.0
Critical
EPSS probability2.44%
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_S2 polygon parsing allows attackers to execute code through a crafted polygon file. The SNC_io_parser::read_facet() method reads an untrusted facet index and uses it directly in Halffacet_of[index] to set fh->twin() without a bounds check. Any application that passes attacker-controlled Nef_S2 data to the affected parser exposes its process to invalid object assignment, type confusion, and code execution.

The record

CVE
CVE-2020-28623
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?

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

  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

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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 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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