Buffer overflow in Kamailio
CVE-2020-27507
The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, leading to a buffer overflow that crashes the server or possibly have unspecified other impact.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.012 (66.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/kamailio/kamailio/issues/2503 (Exploit, Issue Tracking)
- github.com/kamailio/kamailio/commit/ada3701d22b1fd579f06b4f54fa695fa988e685f (Patch)
- lists.debian.org/debian-lts-announce/2023/05/msg00030.html (mailing-list)
Frequently asked questions
- What is CVE-2020-27507?
- CVE-2020-27507 is a critical-severity vulnerability in Kamailio, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-03-15.
- How severe is CVE-2020-27507?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2020-27507 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.