CVE-2021-3751

Name: CVE-2021-3751
Creator: NVD / NIST
Published: 2021-09-15T07:15:06.98+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.20%

Last modified Jun 17, 2026

CVE-2021-3751 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. libmobi is vulnerable to Out-of-bounds Write. EPSS estimates a 1.20% chance of exploitation in the next 30 days.

Description

libmobi is vulnerable to Out-of-bounds Write

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.20%

64.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Libmobi Project	Libmobi	< 0.7

References

https://github.com/bfabiszewski/libmobi/commit/ab5bf0e37e540eac682a14e628853b918626e72bPatch, Third Party Advisory
https://huntr.dev/bounties/fcb4383c-bc27-4b89-bfce-6b041f0cb769Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/bfabiszewski/libmobi/commit/ab5bf0e37e540eac682a14e628853b918626e72bPatch, Third Party Advisory
https://huntr.dev/bounties/fcb4383c-bc27-4b89-bfce-6b041f0cb769Exploit, Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Sep 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3751?

libmobi is vulnerable to Out-of-bounds Write

How severe is CVE-2021-3751?

CVE-2021-3751 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.20% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3751?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3751?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST