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CVE-2021-4164

28
FAUCET Score

CVE-2021-4164 describes a Cross-Site Request Forgery (CSRF) vulnerability affecting janeczku calibre-web. This high-severity vulnerability, rated 8.8 CVSS, allows an unauthenticated attacker to trick a logged-in user into performing unintended actions, potentially leading to full compromise of confidentiality, integrity, and availability. While the attack complexity is low, requiring user interaction, there is currently no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.6.15CPE matchmatch criteria
cpe:2.3:a:janeczku:calibre-web:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.6HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
4.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.54%
Probability of exploitation in next 30 days
EPSS Percentile
42.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0054 is in the 44th percentile among its peer group of 14,855 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 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 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: calibrewebFixed in: 0.6.15

Vendor Advisories (1)

pipGHSA-wxr6-29pv-ch68high

calibre-web is vulnerable to Cross-Site Request Forgery (CSRF)

Jan 21, 2022

References

github.com / janeczku/calibre-web/commit/785726deee13b4d56f6c3503dd57c1e3eb7d6f30
PatchThird Party Advisory
huntr.dev / bounties/2debace1-a0f3-45c1-95fa-9d0512680758
ExploitThird Party Advisory