CVE-2021-40529
low-risk
Published 2021-09-06
The ElGamal implementation in Botan through 2.18.1, as used in Thunderbird and other products, 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?
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0.30% chance of exploitation
EPSS score — low exploit probability
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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 (4)
Affected Vendors
References (14)
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/202208-14
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/202208-14
29
/ 100
low-risk
Severity
18/34 · Moderate
Exploitability
1/34 · Minimal
Exposure
10/34 · Low