PT-2021-7691 · Ericsson+2 · Erlang/Otp+2

Published 2021-01-15 · Updated 2025-11-18 · CVE-2020-35733

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:C/I:N/A:N

Name of the Vulnerable Software and Affected Versions Erlang/OTP versions prior to 23.2.2

Description An issue was discovered in the ssl application, which accepts and trusts an invalid X.509 certificate chain to a trusted root Certification Authority. This could allow a remote attacker to gain access to confidential data due to errors in the certificate authentication procedure.

Recommendations For versions prior to 23.2.2, update to version 23.2.2 or later to resolve the issue. As a temporary workaround, consider restricting the use of the ssl application version 10.2 until a patch is available. Avoid trusting certificate chains that are not properly validated to minimize the risk of exploitation.

Fix

Improper Certificate Validation

Weakness Enumeration

CWE-295

Related Identifiers

ALT-PU-2021-3065

ALT-PU-2021-3284

ALT-PU-2024-9499

BDU:2023-01664

CVE-2020-35733

OPENSUSE-SU-2024:10740-1

OPENSUSE-SU-2025:15740-1

Affected Products

Alt Linux

Astra Linux

Erlang/Otp

References · 28

• https://nvd.nist.gov/vuln/detail/CVE-2020-35733 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2024:10740-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-35733 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-35733 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E4CXZWUOZELT7A5ZN6DJRQHX7L35V4PW · Vendor Advisory
• https://erlang.org/pipermail/erlang-questions/2021-January/100357.html · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-35733 · Vendor Advisory
• https://erlang.org/downloads · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-35733 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-35733 · Vendor Advisory
• https://erlang.org/news · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2023-0303SE17MD · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-35733 · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-01664 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2025:15740-1 · Vendor Advisory