CVE-2020-35636

Name: CVE-2020-35636
Creator: NVD / NIST
Published: 2021-03-04T20:15:13.3+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.26%

Last modified Jun 17, 2026

CVE-2020-35636 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A code execution vulnerability exists in the Nef polygon-parsing functionality of CGAL libcgal CGAL-5.1.1 in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sface() sfh->volume() OOB read. A specially crafted malformed file can lead to an out-of-bounds read and type confusion, which could lead to code execution. EPSS estimates a 3.26% chance of exploitation in the next 30 days.

Description

A code execution vulnerability exists in the Nef polygon-parsing functionality of CGAL libcgal CGAL-5.1.1 in Nef_S2/SNC_io_parser.h SNC_io_parser::read_sface() sfh->volume() OOB read. A specially crafted malformed file can lead to an out-of-bounds read and type confusion, which could lead to code execution. An attacker can provide malicious input to trigger this vulnerability.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.26%

86.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cgal	Computational Geometry Algorithms Library	5.1.1
Debian	Debian Linux	10.0

References

https://lists.debian.org/debian-lts-announce/2022/12/msg00011.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202305-34
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1225Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00011.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202305-34
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1225Exploit, Third Party Advisory

Timeline

Published: Mar 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35636?

How severe is CVE-2020-35636?

CVE-2020-35636 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.26% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35636?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-35636?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST