CVE-2021-33560
- State
- Published
- Severity
- 7.5 High
- Published
- Jun 8, 2021
- Updated
- Oct 14, 2026
- Reserved
- May 24, 2021
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | CISA-ADP |
Weaknesses
- CWE-325 Missing Cryptographic Step
Affected Products
| Product | Versions |
|---|---|
n/an/a |
|
References
- https://dev.gnupg.org/T5328
- [debian-lts-announce] 20210624 [SECURITY] [DLA 2691-1] libgcrypt20 security updatemailing-list
- FEDORA-2021-24d4e06195vendor-advisory
- FEDORA-2021-31fdc84207vendor-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
- GLSA-202210-13vendor-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
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