Description
A flaw has been found in Kamailio 5.5. The impacted element is the function rve_is_constant of the file src/core/rvalue.c. This manipulation causes null pointer dereference. The attack needs to be launched locally. The exploit has been published and may be used. It is still unclear if this vulnerability genuinely exists. This attack requires manipulating config files which might not be a realistic scenario in many cases. The vendor was contacted early about this disclosure but did not respond in any way.
Affected products
kamailio: kamailio
References9
- shimo.im/docs/aBAYMVMB2jUP9jAj/ ExploitThird Party Advisory
- shimo.im/docs/aBAYMVMB2jUP9jAj ExploitThird Party Advisory
- vuldb.com/?ctiid.329876 Permissions RequiredVDB Entry
- vuldb.com/?id.329876 Third Party AdvisoryVDB Entry
- vuldb.com/?submit.673240 Third Party AdvisoryVDB Entry
- www.openwall.com/lists/oss-security/2025/11/02/3
- www.openwall.com/lists/oss-security/2025/10/27/12
- www.openwall.com/lists/oss-security/2025/10/27/8
- www.openwall.com/lists/oss-security/2025/10/27/8 Issue TrackingMailing List
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - CVSS 4.0
-
1.9
LOW
Score source: CNA
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 15 · as of 10 November 2026
- CWE
- CWE-404CWE-476
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.