CVE-2025-12207
Kamailio Grammar Rule cfg.y yyerror_at null pointer dereference
A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. Such manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. The actual existence of this vulnerability is currently in question. 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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
4.8
Kamailio Grammar Rule cfg.y yyerror_at null pointer dereference
A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. Such manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. The actual existence of this vulnerability is currently in question. 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.
- Record
CVE-2025-12207- CVSS 4.0
- 4.8 Medium
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 - CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R - CVSS 3.0
- 3.3 Low
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R - CVSS 2.0
- 1.7
AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR - Weakness
- CWE-476, CWE-404
- Updated
- 2026-11-02
EUVDEUVD-2025-36068
4.8
A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. Such manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. The actual existence of this vulnerability is currently in question. 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.
- Record
EUVD-2025-36068- CVSS 4.0
- 4.8 Medium
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-c7cc-4r75-qhxm
1.9
A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file...
A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. Such manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
- Record
GHSA-c7cc-4r75-qhxm- CVSS 4.0
- 1.9 Low
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 - CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-404, CWE-476
- Updated
- 2026-11-02
NVD
1.9
A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. Such manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. The actual existence of this vulnerability is currently in question. 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.
- Record
CVE-2025-12207- CVSS 4.0
- 1.9 Low
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 - CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L - CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 1.7 Low
AV:L/AC:L/Au:S/C:N/I:N/A:P - Weakness
- CWE-404, CWE-476
- Updated
- 2026-11-02
OSV
1.9
Kamailio Grammar Rule cfg.y yyerror_at null pointer dereference
A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. Such manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. The actual existence of this vulnerability is currently in question. 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.
- Record
CVE-2025-12207- CVSS 4.0
- 1.9 Low
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 - Weakness
- CWE-404, CWE-476
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2025-12207
5.5
A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. Such manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. The actual existence of this vulnerability is currently in question. 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.
- Record
DEBIAN-CVE-2025-12207- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2025-12207
1.9
A vulnerability has been found in Kamailio 5.5. This affects the function yyerror_at of the file src/core/cfg.y of the component Grammar Rule Handler. Such manipulation leads to null pointer dereference. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. The actual existence of this vulnerability is currently in question. 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.
- Record
UBUNTU-CVE-2025-12207- CVSS 4.0
- 1.9 Low
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 - CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
kamailioDebian:12 |
All versions, plus listed versions 5.6.3-25.6.4-15.7.0-15.7.2-15.7.3-1 Show 24 moreShow less5.7.4-15.8.2-25.8.2-35.8.2-45.8.3-15.8.4-15.8.5-16.0.0-16.0.1-16.0.2-16.0.2-26.0.2-36.0.3-16.0.3-26.0.3-36.0.4-16.0.5-16.1.1-26.1.1-2.16.1.2-16.1.3-16.1.3-26.1.4-16.1.5-1 |
None known |
kamailioDebian:13 |
All versions, plus listed versions 6.0.1-16.0.1-1+deb13u16.0.1-1+deb13u26.0.2-16.0.2-2 Show 13 moreShow less6.0.2-36.0.3-16.0.3-26.0.3-36.0.4-16.0.5-16.1.1-26.1.1-2.16.1.2-16.1.3-16.1.3-26.1.4-16.1.5-1 |
None known |
kamailioDebian:14 |
All versions, plus listed versions 6.0.1-16.0.2-16.0.2-26.0.2-36.0.3-1 Show 11 moreShow less6.0.3-26.0.3-36.0.4-16.0.5-16.1.1-26.1.1-2.16.1.2-16.1.3-16.1.3-26.1.4-16.1.5-1 |
None known |
kamailioUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 4.3.1-2ubuntu14.3.4-1.1ubuntu14.3.4-1.1ubuntu24.3.4-1.1ubuntu2.14.3.4-1.1ubuntu2.1+esm14.3.4-1.1ubuntu2.1+esm2 |
None known |
kamailioUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 4.4.2-3ubuntu55.0.4-1ubuntu15.1.1-1ubuntu15.1.1-1ubuntu45.1.2-1ubuntu15.1.2-1ubuntu25.1.2-1ubuntu2+esm15.1.2-1ubuntu2+esm2 |
None known |
kamailioUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 5.2.3-1build35.2.3-1build45.3.0-25.3.1-15.3.2-1build1 Show 4 moreShow less5.3.2-1build25.3.2-1build35.3.2-1ubuntu0.1~esm15.3.2-1ubuntu0.1~esm2 |
None known |
kamailioUbuntu:22.04:LTS |
All versions, plus listed versions 5.4.4-1build15.4.4-1ubuntu15.4.4-1ubuntu25.5.4-1 |
None known |
kamailioUbuntu:24.04:LTS |
All versions, plus listed versions 5.7.0-1build15.7.2-1build15.7.3-15.7.4-15.7.4-1build15.7.4-1build55.7.4-1build7 |
None known |
kamailioUbuntu:25.10 |
All versions, plus listed versions 5.8.4-1build16.0.1-1build26.0.2-2 |
None known |
kamailioUbuntu:26.10 |
All versions, plus listed versions 6.0.5-1ubuntu16.1.2-1ubuntu26.1.2-1ubuntu36.1.2-1ubuntu4 |
None known |
kamailioUbuntu:26.04:LTS |
All versions, plus listed versions 6.0.2-26.0.5-16.0.5-1build16.0.5-1ubuntu1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-12207 is a medium vulnerability (CVSS 4.8) in Kamailio, published October 27, 2025. Its validity is disputed. EPSS puts the chance of exploitation in the next 30 days at 0.23%, the 14th percentile.
References
vuldb.com?id.329877
vuldb.com?ctiid.329877
vuldb.com?submit.673241
shimo.im/docs/vVqRMVMlrycMO63y
openwall.com/lists/oss-security/2025/11/02/3
openwall.com/lists/oss-security/2025/10/27/8
Show 7 moreShow less
openwall.com/lists/oss-security/2025/10/27/12
nvd.nist.gov/vuln/detail/CVE-2025-12207
github.com/advisories/GHSA-c7cc-4r75-qhxm
github.com/CVEProject/cvelistV5/tree/main/cves/2025/12xxx/CVE-2025-12207.json
security-tracker.debian.org/tracker/CVE-2025-12207
ubuntu.com/security/CVE-2025-12207
cve.org/CVERecord?id=CVE-2025-12207