gnupg libgcrypt CVE-2021-33560 vulnerability in Gnupg and Other Products
Published on June 8, 2021

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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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Vulnerability Analysis

CVE-2021-33560 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
NONE
Availability Impact:
NONE

Weakness Type

Missing Cryptographic Step

The product does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than advertised by the algorithm.


Products Associated with CVE-2021-33560

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2021-33560 are published in these products:

Gnupg Libgcrypt
 
Debian Linux
 
Fedora Project Fedora
 
Oracle Communications Cloud Native Core Network Repository Function
 
Oracle Communications Cloud Native Core Network Function Cloud Native Environment
 
Oracle Communications Cloud Native Core Network Slice Selection Function
 
Oracle Communications Cloud Native Core Service Communication Proxy
 
Oracle Communications Cloud Native Core Binding Support Function
 

Exploit Probability

EPSS
0.43%
Percentile
61.75%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.