CVE-2021-33560

7.5 HIGH
Published: June 08, 2021 Modified: December 03, 2025
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://dev.gnupg.org/T5305
Source: cve@mitre.org
Release Notes Vendor Advisory
https://dev.gnupg.org/T5328
Source: cve@mitre.org
Vendor Advisory
https://dev.gnupg.org/T5466
Source: cve@mitre.org
Release Notes Vendor Advisory
https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61
Source: cve@mitre.org
Patch Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00021.html
Source: cve@mitre.org
Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/
Source: cve@mitre.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL/
Source: cve@mitre.org
https://security.gentoo.org/glsa/202210-13
Source: cve@mitre.org
Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html
Source: cve@mitre.org
Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html
Source: cve@mitre.org
Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html
Source: cve@mitre.org
Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html
Source: cve@mitre.org
Third Party Advisory
https://dev.gnupg.org/T5305
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes Vendor Advisory
https://dev.gnupg.org/T5328
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
https://dev.gnupg.org/T5466
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes Vendor Advisory
https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00021.html
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL/
Source: af854a3a-2127-422b-91ae-364da2661108
https://security.gentoo.org/glsa/202210-13
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory

24 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.5 / 10.0
EPSS (Exploit Probability)
0.4%
62th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-203 CWE-325

Affected Vendors

gnupg oracle debian fedoraproject

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