CVE-2021-36531

Name: CVE-2021-36531
Creator: NVD / NIST
Published: 2021-08-27T16:15:07.34+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.06%

Last modified Jun 17, 2026

CVE-2021-36531 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. ngiflib 0.4 has a heap overflow in GetByte() at ngiflib.c:70 in NGIFLIB_NO_FILE mode, GetByte() reads memory buffer without checking the boundary.. EPSS estimates a 1.06% chance of exploitation in the next 30 days.

Description

ngiflib 0.4 has a heap overflow in GetByte() at ngiflib.c:70 in NGIFLIB_NO_FILE mode, GetByte() reads memory buffer without checking the boundary.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.06%

60.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Miniupnp Project	Ngiflib	0.4

References

https://github.com/miniupnp/ngiflib/issues/18Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/miniupnp/ngiflib/issues/18Exploit, Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Aug 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36531?

ngiflib 0.4 has a heap overflow in GetByte() at ngiflib.c:70 in NGIFLIB_NO_FILE mode, GetByte() reads memory buffer without checking the boundary.

How severe is CVE-2021-36531?

CVE-2021-36531 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36531?

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-2021-36531?

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

Scan your code now

Source: NVD / NIST