What’s Vulnerable › Vulnerabilities

CVE-2020-9283: Improper Verification of Cryptographic Signature in golang.org/x/crypto

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 20.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-02-20 · updated 2026-06-17
• Weakness: CWE-347

Description

golang.org/x/crypto before v0.0.0-20200220183623-bac4c82f6975 for Go allows a panic during signature verification in the golang.org/x/crypto/ssh package. A client can attack an SSH server that accepts public keys. Also, a server can attack any SSH client.

Affected products

• Debian Linux: 9.0
• Golang Package Ssh: 0.0.0-20200220183623-bac4c82f6975
• Golang.Org/X/Crypto: before 0.0.0-20200220183623-bac4c82f6975 — fixed in 0.0.0-20200220183623-bac4c82f6975

How to fix

Upgrade to a fixed version: Golang.Org/X/Crypto 0.0.0-20200220183623-bac4c82f6975. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/156480/Go-SSH-0.0.2-Denial-Of-Service.html
• https://groups.google.com/forum/#%21topic/golang-announce/3L45YRc91SY
• https://lists.debian.org/debian-lts-announce/2020/10/msg00014.html
• https://lists.debian.org/debian-lts-announce/2020/11/msg00027.html
• https://lists.debian.org/debian-lts-announce/2020/11/msg00031.html
• https://lists.debian.org/debian-lts-announce/2023/06/msg00017.html
• http://packetstormsecurity.com/files/156480/Go-SSH-0.0.2-Denial-Of-Service.html
• https://groups.google.com/forum/#%21topic/golang-announce/3L45YRc91SY
• https://lists.debian.org/debian-lts-announce/2020/10/msg00014.html
• https://lists.debian.org/debian-lts-announce/2020/11/msg00027.html
• https://lists.debian.org/debian-lts-announce/2020/11/msg00031.html
• https://lists.debian.org/debian-lts-announce/2023/06/msg00017.html

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