What is CVE-2023-28095?

CVE-2023-28095 is a high-severity vulnerability in Opensips, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2023-03-15.

How severe is CVE-2023-28095?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2023-28095 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Opensips

CVE-2023-28095

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Versions prior to 3.1.7 and 3.2.4 have a potential issue in `msg_translator.c:2628` which might lead to a server crash. This issue was found while fuzzing the function `build_res_buf_from_sip_req` but could not be reproduced against a running instance of OpenSIPS. This issue could not be exploited against a running instance of OpenSIPS since no public function was found to make use of this vulnerable code. Even in the case of exploitation through unknown vectors, it is highly unlikely that this issue would lead to anything other than Denial of Service. This issue has been fixed in versions 3.1.7 and 3.2.4.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2023-03-15 · last modified 2026-06-17.

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:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (60.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Opensips — versions < 3.1.7, >= 3.2.0, < 3.2.4

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

karimhabush/cyberowl

References

github.com/OpenSIPS/opensips/security/advisories/GHSA-7pf3-24qg-8v9h (Third Party Advisory)
github.com/OpenSIPS/opensips/commit/9cf3dd3398719dd91207495f76d7726701c5145c (Patch, Third Party Advisory)
opensips.org/pub/audit-2022/opensips-audit-technical-report-full.pdf (Vendor Advisory)

Frequently asked questions

What is CVE-2023-28095?: CVE-2023-28095 is a high-severity vulnerability in Opensips, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2023-03-15.
How severe is CVE-2023-28095?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2023-28095 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.