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CVE-2020-13485

23
FAUCET Score

CVE-2020-13485 describes a critical vulnerability in the Knock Knock plugin for Craft CMS, versions prior to 1.2.8, allowing an attacker to bypass IP whitelist restrictions. This flaw, rated 9.1 CVSS (Critical), enables unauthenticated remote attackers to gain unauthorized access by manipulating the X-Forwarded-For HTTP header, potentially leading to high confidentiality and integrity impacts. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.2.8CPE matchmatch criteria
cpe:2.3:a:verbb:knock_knock:*:*:*:*:*:craft_cms:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.35%
Probability of exploitation in next 30 days
EPSS Percentile
68.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0135 is in the 55th percentile among its peer group of 36,862 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

composerpatch availablevia ghsa
Product: verbb/knock-knockFixed in: 1.2.8

Vendor Advisories (1)

composerGHSA-wxvr-qqm7-6h65critical

Knock Knock plugin IP Whitelist bypass via an X-Forwarded-For HTTP header

May 24, 2022

References

github.com / verbb/knock-knock/blob/craft-3/CHANGELOG.md
Release NotesThird Party Advisory
limpidsecurity.pl / security-advisories/1/knock-knock-plugin-for-craft-cms
ExploitThird Party Advisory