CVE-2025-5987

HIGH 8.1

Libssh: invalid return code for chacha20 poly1305 with openssl backend

CVSS Score

8.1

EPSS Score

0.1%

EPSS Percentile

15th

A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSL library. If an attacker manages to exhaust the heap space, this error is not detected and may lead to libssh using a partially initialized cipher context. This occurs because the OpenSSL error code returned aliases with the SSH_OK code, resulting in libssh not properly detecting the error returned by the OpenSSL library. This issue can lead to undefined behavior, including compromised data confidentiality and integrity or crashes.

CWE	CWE-393
Published	Jul 7, 2025
Last Updated	Mar 20, 2026

Stay Ahead of the Next One

Get instant alerts for

Be the first to know when new high vulnerabilities are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Red Hat / Red Hat Enterprise Linux 10

All versions affected

Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

All versions affected

Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support

All versions affected

Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4.13

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4.14

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4.15

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4.16

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4.17

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4.18

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4.19

All versions affected

Red Hat / Red Hat OpenShift Container Platform 4.20

All versions affected

Red Hat / Red Hat Enterprise Linux 6

All versions affected

Red Hat / Red Hat Enterprise Linux 7

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗