CVE-2020-28631Public exploitNetwork attack vector

Code execution via unchecked Nef_S2 edge index

Published Apr 18, 2022 · Updated Apr 23, 2025

Out-of-bounds read in CGAL 5.1.1 Nef_S2 parsing allows remote attackers to execute code by supplying a malformed Nef file. SNC_io_parser::read_sedge uses a file-derived index to read Edge_of without bounds validation, then assigns the resulting invalid handle to seh->source(). The flaw is reached when a consuming application parses attacker-controlled Nef_S2 data, and the invalid handle can produce type confusion and code execution.

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

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in CGAL 5.1.1 Nef_S2 parsing allows remote attackers to execute code by supplying a malformed Nef file. SNC_io_parser::read_sedge uses a file-derived index to read Edge_of without bounds validation, then assigns the resulting invalid handle to seh->source(). The flaw is reached when a consuming application parses attacker-controlled Nef_S2 data, and the invalid handle can produce type confusion and code execution.

The record

CVE
CVE-2020-28631
Published
Apr 18, 2022
Updated
Apr 23, 2025
Vendor
CGAL Project
Product
CGAL
Classifications
CWE-129, T1203
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

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

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo