2021-34558 | Google Go X.509 Certificate certificate validation
|CVSS Meta Temp Score
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|Current Exploit Price (≈)
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|CTI Interest Score
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A vulnerability has been found in Google Go up to 1.16.5 (Programming Language Software) and classified as critical. Affected by this vulnerability is some unknown functionality of the component X.509 Certificate Handler. The manipulation with an unknown input leads to a weak authentication vulnerability. The CWE definition for the vulnerability is CWE-295. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:
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.
The weakness was shared 07/16/2021. The advisory is shared at groups.google.com. This vulnerability is known as CVE-2021-34558 since 06/10/2021. The exploitation appears to be easy. The attack can only be initiated within the local network. The exploitation doesn’t need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/19/2021). MITRE ATT&CK project uses the attack technique T1587.003 for this issue.
There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.3
VulDB Base Score: 6.3
VulDB Temp Score: 6.3
VulDB Vector: 🔒
VulDB Reliability: 🔍
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Weak authentication
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒
Active Actors: 🔍
Active APT Groups: 🔍Recommended: no mitigation known
0-Day Time: 🔒
06/10/2021 CVE assigned
07/16/2021 +36 days Advisory disclosed
07/16/2021 +0 days VulDB entry created
07/19/2021 +3 days VulDB last updateVendor: https://www.google.com/
CVE: CVE-2021-34558 (🔒)
Created: 07/16/2021 11:27
Updated: 07/19/2021 14:47
Changes: (2) source_cve_assigned source_cve_nvd_summary
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