Which products and versions are affected by CVE-2023-25076?

Affected: SNIProxy (Sniproxy Project) versions 0.6.0-2, 0.6.1, >= 0.6.0-2. The full list is in the CVE brief.

Is CVE-2023-25076 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2023-25076 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2023-25076?

Public exploit code is available.

Is there a fix for CVE-2023-25076?

Fixed versions are available, including SNIProxy 0.5.0-2ubuntu0.1~esm1, SNIProxy 0.6.0-1+deb10u1, SNIProxy 0.6.0-1ubuntu0.1.

How urgently should CVE-2023-25076 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2023-25076

CriticalPublic exploit

A buffer overflow vulnerability exists in the handling of wildcard backend hosts of SNIProxy 0.6.0-2 and the master branch (commit: 822bb80df9b7b345cc9eba55df74a07b498819ba).

Published Mar 30, 2023 · Updated Aug 12, 2026 · Also known as DEBIAN-CVE-2023-25076, DLA-3406-1, DSA-5413-1, UBUNTU-CVE-2023-25076, USN-6148-1

Key Facts

Patch immediately

CVE-2023-25076 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting SNIProxy (Sniproxy Project).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 66% probability of exploitation in the next 30 days.
Fixed versions are available, including SNIProxy 0.5.0-2ubuntu0.1~esm1, SNIProxy 0.6.0-1+deb10u1, SNIProxy 0.6.0-1ubuntu0.1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

66%

Higher than 99.2% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2023-25076 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

A buffer overflow vulnerability exists in the handling of wildcard backend hosts of SNIProxy 0.6.0-2 and the master branch (commit: 822bb80df9b7b345cc9eba55df74a07b498819ba). A specially crafted HTTP or TLS packet can lead to arbitrary code execution. An attacker could send a malicious packet to trigger this vulnerability.

Affected Products

23 affected entries in total

Product	Affected versions	Fixed in
SNIProxySniproxy Project	0.6.0-2, 0.6.1, >= 0.6.0-2	0.6.0-2+deb11u1

Patched Releases

SNIProxy

0.5.0-2ubuntu0.1~esm1, 0.6.0-1+deb10u1, 0.6.0-1ubuntu0.1, 0.6.0-2.1, 0.6.0-2.1build2, 0.6.0-2+deb11u1, 0.6.0-2ubuntu0.22.04.1

Timeline

Publicly disclosed
Mar 30, 2023
Last updated
Aug 12, 2026

Weakness Type

CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

References

6 more references in the full CVE brief

FAQ

Common Questions.

A buffer overflow vulnerability exists in the handling of wildcard backend hosts of SNIProxy 0.6.0-2 and the master branch (commit: 822bb80df9b7b345cc9eba55df74a07b498819ba).
Affected: SNIProxy (Sniproxy Project) versions 0.6.0-2, 0.6.1, >= 0.6.0-2. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including SNIProxy 0.5.0-2ubuntu0.1~esm1, SNIProxy 0.6.0-1+deb10u1, SNIProxy 0.6.0-1ubuntu0.1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2023-25076 Running On Your Attack Surface?

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