CVE-2021-40528
low-risk
Published 2021-09-06
The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.
Do I need to act?
-
0.10% 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
5
CVSS 5.9/10
Medium
NETWORK
/ HIGH complexity
Affected Products (1)
Libgcrypt
Affected Vendors
References (10)
Technical Description
https://eprint.iacr.org/2021/923
Third Party Advisory
https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elg...
Third Party Advisory
https://security.gentoo.org/glsa/202210-13
Technical Description
https://eprint.iacr.org/2021/923
Third Party Advisory
https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elg...
Third Party Advisory
https://security.gentoo.org/glsa/202210-13
23
/ 100
low-risk
Severity
18/34 · Moderate
Exploitability
0/34 · Minimal
Exposure
5/34 · Minimal