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CVE-2021-34558 Go

Affected softwareGo
Severity6.5 Medium CVSS 3.1 2 scores
WeaknessCWE-295
Published15 Jul 2021
Updated17 Jun 2026

Description

The crypto/tls package of Go through 1.16.5 does not properly assert that the type of public key in an X.509 certificate matches the expected type when doing a RSA based key exchange, allowing a malicious TLS server to cause a TLS client to panic.

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC 1 indexed Published artifacts you can open, in GitHub PoC; first seen 2021-07-13.
  • EPSS 7.0% chance in 30 days
IndexArtifactStarsFirst seen
GitHub PoC alexzorin/cve-2021-34558 45 2021-07-13

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

6.5 MEDIUM v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 6.5 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H NVD Primary published
CVSS 2.0 2.6 none AV:N/AC:H/Au:N/C:N/I:N/A:P NVD Primary

Affected software and releases

Products and versions

6 products, 8 version entries
SourceVendorProductSchemeAffected versions
nvd fedoraproject fedora generic 33 · 34
nvd golang go generic < 1.15.14 · ≥ 1.16.0 and < 1.16.6
nvd netapp cloud insights telegraf generic any version
nvd netapp storagegrid generic any version
nvd netapp trident generic any version
nvd oracle timesten in-memory database generic < 21.1.1.1.0

References

URLTags
https://golang.org/doc/devel/release#go1.16.minor Release Notes, Vendor Advisory
https://groups.google.com/g/golang-announce Mailing List, Third Party Advisory
https://groups.google.com/g/golang-announce/c/n9FxMelZGAQ Mailing List, Release Notes, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3BA7MFVXRBEKRTLSLYDICTYCGEMK2HZ7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3XBQUFVI5TMV4KMKI7GKA223LHGPQISE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6BTC3JQUASFN5U2XA4UZIGAPZQBD5JSS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D7FRFM7WWR2JCT6NORQ7AO6B453OMI3I/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITRXPCHUCJGXCX2CUEPKZRRTB27GG4ZB/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JYIUSR4YP52PWG7YE7AA3DZ5OSURNFJB/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LBMLUQMN6XRKPVOI5XFFBP4XSR7RNTYR/

Timeline

Published2021-07-15By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.