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CWE

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CVE-2021-33560

Published: Jun 8, 2021

Modified: Dec 3, 2025

PUBLISHED

Description

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.

Vendor	Product	Versions
n/a	n/a	affected `n/a`

References

https://dev.gnupg.org/T5328

[debian-lts-announce] 20210624 [SECURITY] [DLA 2691-1] libgcrypt20 security update

mailing-list

FEDORA-2021-24d4e06195

vendor-advisory

FEDORA-2021-31fdc84207

vendor-advisory

https://www.oracle.com/security-alerts/cpuoct2021.html

https://dev.gnupg.org/T5466

https://dev.gnupg.org/T5305

https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61

https://www.oracle.com/security-alerts/cpujan2022.html

https://www.oracle.com/security-alerts/cpuapr2022.html

https://www.oracle.com/security-alerts/cpujul2022.html

vendor-advisory

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