Vulnerability in Kamailio
CVE-2020-28361
Kamailio before 5.4.0, as used in Sip Express Router (SER) in Sippy Softswitch 4.5 through 5.2 and other products, allows a bypass of a header-removal protection mechanism via whitespace characters. This occurs in the remove_hf function in the Kamailio textops module. Particular use of remove_hf in Sippy Softswitch may allow skilled attacker having a valid credential in the system to disrupt internal call start/duration accounting mechanisms leading potentially to a loss of revenue.
Vulnerability class: HTTP Request Smuggling
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.011 (64.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
Weakness classification (CWE)
References
- packetstormsecurity.com/files/159030/Kamailio-5.4.0-Header-Smuggling.html (Exploit, VDB Entry, Third Party Advisory)
- support.sippysoft.com/support/discussions/topics/3000179616 (Permissions Required)
Frequently asked questions
- What is CVE-2020-28361?
- CVE-2020-28361 is a medium-severity vulnerability in Kamailio, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.4/10. Published 2020-11-18.
- How severe is CVE-2020-28361?
- Medium severity. CVSS v3 base score is 5.4 out of 10.