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.

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

EPSS: 0.011 (62.1th percentile) — read the EPSS interpretation.

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.

Affected products

Kamailio
N/a — versions n/a

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

cve@mitre.org (Exploit, VDB Entry, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Permissions Required, x_refsource_MISC)

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.