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Vulnerability Assessment

Weakness
CWE
CWE-203
ASVS 5.0
V6 - Authentication Timing-safe comparisons
Impact

CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 2.3% exploitation probability (EPSS)

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AnalysisAI

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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-203. 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. Affected products include: Gnupg Libgcrypt, Debian Debian Linux, Fedoraproject Fedora, Oracle Communications Cloud Native Core Binding Support Function, Oracle Communications Cloud Native Core Network Function Cloud Native Environment. Version information: before 1.8.8.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

DescriptionNVD

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.

Threat Intelligence Overview

EPSS Score
2.3%
Top 18% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS MSRC

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 2.3%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

40
Low Medium High Critical
KEV: 0
EPSS: +2
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*
cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*

More in Libgcrypt

View all
CVE-2018-6829 HIGH POC
7.5 Feb 07

cipher/elgamal.c in Libgcrypt through 1.8.2, when used to encrypt messages directly, improperly encodes plaintexts, whic
CVE-2021-40528 MEDIUM POC
5.9 Sep 06

The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two c
CVE-2018-0495 MEDIUM POC
4.7 Jun 13

Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be
CVE-2026-41989 MEDIUM
6.7 Apr 23

Heap-based buffer overflow in Libgcrypt before 1.12.2 allows local attackers to trigger denial of service and corrupt me
CVE-2021-3345 HIGH
7.8 Jan 29

_gcry_md_block_write in cipher/hash-common.c in Libgcrypt version 1.9.0 has a heap-based buffer overflow when the digest
CVE-2017-0379 HIGH
7.5 Aug 29

Libgcrypt before 1.8.1 does not properly consider Curve25519 side-channel attacks, which makes it easier for attackers t
CVE-2019-12904 MEDIUM
5.9 Jun 20

In Libgcrypt 1.8.4, the C implementation of AES is vulnerable to a flush-and-reload side-channel attack because physical
CVE-2017-9526 MEDIUM
5.9 Jun 11

In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signin
CVE-2016-6313 MEDIUM
5.3 Dec 13

The mixing functions in the random number generator in Libgcrypt before 1.5.6, 1.6.x before 1.6.6, and 1.7.x before 1.7.
CVE-2026-41990 MEDIUM
4.0 Apr 23

Libgcrypt before version 1.12.2 contains a bounds-check vulnerability in Dilithium signing operations where writes to a

CVE-2014-5270 LOW
2.1 Oct 10

Libgcrypt before 1.5.4, as used in GnuPG and other products, does not properly perform ciphertext normalization and ciph
CVE-2015-7511 LOW
2.0 Apr 19

Libgcrypt before 1.6.5 does not properly perform elliptic-point curve multiplication during decryption, which makes it e

Same weakness CWE-203 – Observable Discrepancy

View all
CVE-2017-5753 MEDIUM POC
5.6
CVE-2017-13099 HIGH POC
7.5
CVE-2017-1000385 MEDIUM POC
5.9
CVE-2017-6168 HIGH POC
7.4
CVE-2017-13098 HIGH POC
7.5
CVE-2017-17427 MEDIUM POC
5.9
CVE-2018-3639 MEDIUM POC
5.5
CVE-2019-25337 CRITICAL POC
9.8

Same technique Information Disclosure

View all
CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2025-68613 HIGH POC
8.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5

References

Advisories & patches
PATCH https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61 PATCH https://www.oracle.com/security-alerts/cpuapr2022.html PATCH https://www.oracle.com/security-alerts/cpujan2022.html PATCH https://www.oracle.com/security-alerts/cpujul2022.html ADVISORY https://dev.gnupg.org/T5305 ADVISORY https://dev.gnupg.org/T5328 ADVISORY https://dev.gnupg.org/T5466 REF https://cert-portal.siemens.com/productcert/html/ssa-398330.html REF https://lists.debian.org/debian-lts-announce/2021/06/msg00021.html REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/ REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL/ REF https://security.gentoo.org/glsa/202210-13 REF https://www.oracle.com/security-alerts/cpuoct2021.html

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