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CVE-2021-3758

22
FAUCET Score

CVE-2021-3758 describes a Server-Side Request Forgery (SSRF) vulnerability affecting BookStack, a documentation platform. This medium-severity flaw (CVSS 6.5) allows an authenticated attacker to perform unauthorized requests from the server, potentially leading to information disclosure or internal network access. While no public exploits, Metasploit modules, or active exploitation have been observed, the vulnerability could still be leveraged by an attacker with legitimate user credentials. Community discussion and media coverage for this CVE are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
< 21.08CPE matchmatch criteria
cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.80%
Probability of exploitation in next 30 days
EPSS Percentile
52.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0080 is in the 64th percentile among its peer group of 21,951 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / bookstackapp/bookstack/commit/bee5e2c7ca637d034c6985c0328cef0ce068778e
PatchThird Party Advisory
huntr.dev / bounties/a8d7fb24-9a69-42f3-990a-2db93b53f76b
ExploitIssue TrackingThird Party Advisory