CVE-2019-25043
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string...
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string index out of range" error and worker-process crash for a "Cookie: =abc" header.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
NVD Score used
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string index out of range" error and worker-process crash for a "Cookie: =abc" header.
- Record
CVE-2019-25043- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-755
- Updated
- 2026-11-02
CVE List No score
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string index out of range" error and worker-process crash for a "Cookie: =abc" header.
- Record
CVE-2019-25043- Updated
- 2026-11-02
EUVDEUVD-2019-11493 No score
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string index out of range" error and worker-process crash for a "Cookie: =abc" header.
- Record
EUVD-2019-11493- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-p89w-8r2h-7mjp
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string...
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string index out of range" error and worker-process crash for a "Cookie: =abc" header.
- Record
GHSA-p89w-8r2h-7mjp- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-755
- Updated
- 2026-11-02
OSV
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string index out of range" error and worker-process crash for a "Cookie: =abc" header.
- Record
CVE-2019-25043- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVDEBIAN-CVE-2019-25043
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string index out of range" error and worker-process crash for a "Cookie: =abc" header.
- Record
DEBIAN-CVE-2019-25043- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVUBUNTU-CVE-2019-25043
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string index out of range" error and worker-process crash for a "Cookie: =abc" header.
- Record
UBUNTU-CVE-2019-25043- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
modsecurityDebian:12 |
before 3.0.4-1 | 3.0.4-1 |
modsecurityDebian:13 |
before 3.0.4-1 | 3.0.4-1 |
modsecurityDebian:14 |
before 3.0.4-1 | 3.0.4-1 |
modsecurityUbuntu:20.04:LTS |
All versions, plus listed versions 3.0.3-13.0.4-13.0.4-1build1 |
None known |
modsecurityUbuntu:22.04:LTS |
All versions, plus listed versions 3.0.4-23.0.6-1 |
None known |
modsecurityUbuntu:24.04:LTS |
All versions, plus listed versions 3.0.10-13.0.11-13.0.12-13.0.12-1.1build13.0.12-1.1build2 |
None known |
modsecurityUbuntu:25.10 |
All versions, plus listed versions 3.0.13-13.0.14-13.0.14-1build1 |
None known |
modsecurityUbuntu:26.10 |
All versions, plus listed versions 3.0.14-1build23.0.15-13.0.16-1 |
None known |
modsecurityUbuntu:26.04:LTS |
All versions, plus listed versions 3.0.14-1build13.0.14-1build2 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-25043 is a medium vulnerability (CVSS 5.3) in Owasp Modsecurity, published May 6, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.22%, the 68th percentile. Fixed in modsecurity 3.0.4-1.