CVE-2021-33560
moderate-risk
Published 2021-06-08
Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. This, for example, affects use of ElGamal in OpenPGP.
Do I need to act?
-
0.43% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10
High
NETWORK
/ LOW complexity
Affected Products (12)
Libgcrypt
Affected Vendors
References (24)
Release Notes
https://dev.gnupg.org/T5305
Vendor Advisory
https://dev.gnupg.org/T5328
Release Notes
https://dev.gnupg.org/T5466
Third Party Advisory
https://security.gentoo.org/glsa/202210-13
Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html
Release Notes
https://dev.gnupg.org/T5305
Vendor Advisory
https://dev.gnupg.org/T5328
Release Notes
https://dev.gnupg.org/T5466
Third Party Advisory
https://security.gentoo.org/glsa/202210-13
and 4 more references
45
/ 100
moderate-risk
Severity
26/34 · High
Exploitability
2/34 · Minimal
Exposure
17/34 · Moderate