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CVE-2021-3751

32
FAUCET Score

CVE-2021-3751 describes an Out-of-bounds Write vulnerability within the libmobi_project libmobi library. This critical flaw, rated 9.8 CVSS, allows unauthenticated attackers to achieve high impact on confidentiality, integrity, and availability over a network with low attack complexity. While there is no evidence of active exploitation, public exploit code, or KEV listing, the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.7CPE matchmatch criteria
cpe:2.3:a:libmobi_project:libmobi:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.6CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
6.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.24%
Probability of exploitation in next 30 days
EPSS Percentile
66.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0124 is in the 52nd percentile among its peer group of 36,897 CVEs.

Social Chatter

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)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / bfabiszewski/libmobi/commit/ab5bf0e37e540eac682a14e628853b918626e72b
PatchThird Party Advisory
huntr.dev / bounties/fcb4383c-bc27-4b89-bfce-6b041f0cb769
ExploitIssue TrackingPatchThird Party Advisory