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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact None

Availability Impact None

This CVE is not in the KEV list.

The EPSS score is 0.00425.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
n/a n/a affected
Version Status Constraints
n/a affected —

Configuration 1 [-]

OR cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*
cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*

Configuration 2 [-]

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Configuration 3 [-]

OR cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

Configuration 4 [-]

OR cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.11.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.9.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.14.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.15.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.15.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_slice_selection_function:1.8.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_service_communication_proxy:1.15.0:*:*:*:*:*:*:*
Package CPE Advisory Released Date
Red Hat Enterprise Linux 8
libgcrypt-0:1.8.5-6.el8 cpe:/o:redhat:enterprise_linux:8 RHSA-2021:4409 2021-11-09T00:00:00Z

No data.

Project Subscriptions

Vendors Products
Debian Subscribe
Debian Linux Subscribe
Fedoraproject Subscribe
Fedora Subscribe
Gnupg Subscribe
Libgcrypt Subscribe
Oracle Subscribe
Communications Cloud Native Core Binding Support Function Subscribe
Communications Cloud Native Core Network Function Cloud Native Environment Subscribe
Communications Cloud Native Core Network Repository Function Subscribe
Communications Cloud Native Core Network Slice Selection Function Subscribe
Communications Cloud Native Core Service Communication Proxy Subscribe
Redhat Subscribe
Enterprise Linux Subscribe
Advisories
Source ID Title
Debian DLA Debian DLA DLA-2691-1 libgcrypt20 security update
EUVD EUVD EUVD-2021-20252 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.
Ubuntu USN Ubuntu USN USN-5080-1 Libgcrypt vulnerabilities
Ubuntu USN Ubuntu USN USN-5080-2 Libgcrypt vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://dev.gnupg.org/T5305 cve-icon cve-icon
https://dev.gnupg.org/T5328 cve-icon cve-icon cve-icon
https://dev.gnupg.org/T5466 cve-icon cve-icon
https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61 cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2021/06/msg00021.html cve-icon cve-icon
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/ cve-icon cve-icon
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL/ cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2021-33560 cve-icon
https://security.gentoo.org/glsa/202210-13 cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2021-33560 cve-icon
https://www.oracle.com/security-alerts/cpuapr2022.html cve-icon cve-icon
https://www.oracle.com/security-alerts/cpujan2022.html cve-icon cve-icon
https://www.oracle.com/security-alerts/cpujul2022.html cve-icon cve-icon
https://www.oracle.com/security-alerts/cpuoct2021.html cve-icon cve-icon
History

Wed, 03 Dec 2025 15:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-325
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-12-03T14:39:10.763Z

Reserved: 2021-05-24T00:00:00.000Z

Link: CVE-2021-33560

cve-icon Vulnrichment

Updated: 2024-08-03T23:50:43.035Z

cve-icon NVD

Status : Modified

Published: 2021-06-08T11:15:07.767

Modified: 2025-12-03T15:15:49.833

Link: CVE-2021-33560

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-06-02T00:00:00Z

Links: CVE-2021-33560 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses