Vulnerability in Gnupg Libgcrypt
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.024 (83.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.023 · newest: 0.024 · change: +0.000
Affected products
- Gnupg Libgcrypt
- Oracle Communications Cloud Native Core Binding Support Function — versions 1.11.0
- Oracle Communications Cloud Native Core Network Function Environment — versions 1.9.0, 1.10.0
- Oracle Communications Cloud Native Core Network Repository Function — versions 1.14.0, 1.15.0, 1.15.1
- Oracle Communications Cloud Native Core Network Slice Selection Function — versions 1.8.0
- Oracle Communications Cloud Native Core Service Communication Proxy — versions 1.15.0
- Debian Linux — versions 9.0
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
Public proof-of-concept exploits
References
- dev.gnupg.org/T5328 (Vendor Advisory)
- lists.debian.org/debian-lts-announce/2021/06/msg00021.html (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.oracle.com/security-alerts/cpuoct2021.html (Third Party Advisory)
- dev.gnupg.org/T5466 (Release Notes, Vendor Advisory)
- dev.gnupg.org/T5305 (Release Notes, Vendor Advisory)
- dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61 (Patch, Vendor Advisory)
- www.oracle.com/security-alerts/cpujan2022.html (Patch, Third Party Advisory)
- www.oracle.com/security-alerts/cpuapr2022.html (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-33560?
- CVE-2021-33560 is a high-severity vulnerability in Gnupg Libgcrypt, classified under Observable Discrepancy. CVSS score: 7.5/10. Published 2021-06-08.
- How severe is CVE-2021-33560?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-33560 known to be exploited?
- 15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.