What is CVE-2023-27585?

CVE-2023-27585 is a high-severity vulnerability in Pjsip Pjproject, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2023-03-14.

How severe is CVE-2023-27585?

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

Is CVE-2023-27585 known to be exploited?

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

Buffer overflow in Pjsip Pjproject

CVE-2023-27585

PJSIP is a free and open source multimedia communication library written in C. A buffer overflow vulnerability in versions 2.13 and prior affects applications that use PJSIP DNS resolver. It doesn't affect PJSIP users who do not utilise PJSIP DNS resolver. This vulnerability is related to CVE-2022-24793. The difference is that this issue is in parsing the query record `parse_query()`, while the issue in CVE-2022-24793 is in `parse_rr()`. A patch is available as commit `d1c5e4d` in the `master` branch. A workaround is to disable DNS resolution in PJSIP config (by setting `nameserver_count` to zero) or use an external resolver implementation instead.

Vulnerability class: Buffer Overflow

Published 2023-03-14 · 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: 0.023 (82.7th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: -0.000

Affected products

Pjsip Pjproject — versions <= 2.13
Teluu Pjsip

Weakness classification (CWE)

Public proof-of-concept exploits

DiRaltvein/memory-corruption-examples

References

github.com/pjsip/pjproject/security/advisories/GHSA-q9cp-8wcq-7pfr (Patch, Vendor Advisory)
github.com/pjsip/pjproject/security/advisories/GHSA-p6g5-v97c-w5q4 (Vendor Advisory)
github.com/pjsip/pjproject/commit/d1c5e4da5bae7f220bc30719888bb389c905c0c5 (Patch)
www.pjsip.org/pjlib-util/docs/html/group__PJ__DNS__RESOLVER.htm (Product)
lists.debian.org/debian-lts-announce/2023/04/msg00020.html (mailing-list)
www.debian.org/security/2023/dsa-5438 (vendor-advisory)
lists.debian.org/debian-lts-announce/2023/08/msg00038.html (mailing-list)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2023-27585?: CVE-2023-27585 is a high-severity vulnerability in Pjsip Pjproject, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2023-03-14.
How severe is CVE-2023-27585?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2023-27585 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.