Home/CVE/Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to addres
CVE

CVE-2021-33560

Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to addres

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.

HIGH · CVSS 7.5 EPSS 0.00425
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-203Observable Discrepancy
CWE-325Missing Cryptographic Step
▤

Affected Products & Versions

9
gnupg libgcrypt< 1.8.8
gnupg libgcrypt>= 1.9.0 and < 1.9.3
debian linuxall versions
fedoraproject fedoraall versions
oracle communications cloud native core binding support functionall versions
oracle communications cloud native core network function cloud native environmentall versions
oracle communications cloud native core network repository functionall versions
oracle communications cloud native core network slice selection functionall versions
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Jun 2021 · 11:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

15
suse-csafopenSUSE-SU-2024:10941-1
siemens-csafSSA-398330
usnUSN-5080-2
usnUSN-5080-1
rhsaRHSA-2022:5311Moderate
🔗

References & Sources

12
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://dev.gnupg.org/T5305Release NotesVendor Advisory
https://dev.gnupg.org/T5328Vendor Advisory
https://dev.gnupg.org/T5466Release NotesVendor Advisory
https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00021.htmlMailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/
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