CVE-2020-13485
Knock Knock plugin IP Whitelist bypass via an X-Forwarded-For HTTP header
CVE-2020-13485 is a critical vulnerability (CVSS 9.1) in Verbb Knock Knock, published May 25, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.35%, the 72nd percentile. Fixed in verbb/knock-knock 1.2.8.
- Severity
- 9.1 CriticalCVSS 3.1, NVD
- Exploit chance
- 1.35%EPSS, 72nd percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
1.2.8verbb/knock-knock +1 more
Description
The Knock Knock plugin before 1.2.8 for Craft CMS allows IP Whitelist bypass via an X-Forwarded-For HTTP 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
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
verbb/knock-knockPackagist | before 1.2.8 | 1.2.8 |
verbb/knock-knockPackagist | before 1.2.8, plus listed versions 1.0.01.0.11.0.21.0.31.1.0 Show 13 moreShow less1.1.11.1.21.1.31.2.01.2.11.2.21.2.31.2.41.2.4.11.2.4.21.2.51.2.61.2.7 | 1.2.8 |
What each source reports
NVD Score used
The Knock Knock plugin before 1.2.8 for Craft CMS allows IP Whitelist bypass via an X-Forwarded-For HTTP header.
- Record
CVE-2020-13485- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - CVSS 2.0
- 6.4 Medium
AV:N/AC:L/Au:N/C:P/I:P/A:N - Weakness
- CWE-697
- Updated
- 2026-11-02
CVE ListNo score
The Knock Knock plugin before 1.2.8 for Craft CMS allows IP Whitelist bypass via an X-Forwarded-For HTTP header.
- Record
CVE-2020-13485- Updated
- 2026-11-02
EUVDEUVD-2022-5675No score
The Knock Knock plugin before 1.2.8 for Craft CMS allows IP Whitelist bypass via an X-Forwarded-For HTTP header.
- Record
EUVD-2022-5675- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-wxvr-qqm7-6h65
Knock Knock plugin IP Whitelist bypass via an X-Forwarded-For HTTP header
The Knock Knock plugin before 1.2.8 for Craft CMS allows IP Whitelist bypass via an X-Forwarded-For HTTP header.
- Record
GHSA-wxvr-qqm7-6h65- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-697
- Updated
- 2026-11-02
OSV
The Knock Knock plugin before 1.2.8 for Craft CMS allows IP Whitelist bypass via an X-Forwarded-For HTTP header.
- Record
CVE-2020-13485- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-wxvr-qqm7-6h65
Knock Knock plugin IP Whitelist bypass via an X-Forwarded-For HTTP header
The Knock Knock plugin before 1.2.8 for Craft CMS allows IP Whitelist bypass via an X-Forwarded-For HTTP header.
- Record
GHSA-wxvr-qqm7-6h65- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-697
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.