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Status published
Unknown
CVE-2021-33560
Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption...
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://dev.gnupg.org/T5328
- https://lists.debian.org/debian-lts-announce/2021/06/msg00021.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/
- 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
- https://security.gentoo.org/glsa/202210-13
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Affected Vendor
gnupg
View all reports →Affected Software
libgcrypt, debian linux, fedora, communications cloud native core binding support function, communications cloud native core network function cloud native environment, communications cloud native core network repository function, communications cloud native core network slice selection function, communications cloud native core service communication proxy
Vulnerable Versions:
0, 1.9.0, 9.0, 33, 34, 1.11.0, 1.10.0, 1.14.0, 1.15.0, 1.15.1, 1.8.0
Timeline
Official Publish:
June 8th, 2021
Last Modified:
December 3rd, 2025
Added to House:
July 21st, 2026
CVSS Vectors
No vector data available
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.