Is CVE-2021-36530 actively exploited?

No active exploitation of CVE-2021-36530 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-36530 be exploited remotely?

Yes. CVE-2021-36530 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-36530?

CVE-2021-36530 has a CVSS score of 8.8 (HIGH).

HOME VULNERABILITIESCVE-2021-36530

HIGH

CVE-2021-36530

CWE-787Published: August 27, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

ngiflib 0.4 has a heap overflow in GetByteStr() at ngiflib.c:108 in NGIFLIB_NO_FILE mode, GetByteStr() copy memory buffer without checking the boundary.

NVD Source

Technical Analysis

CVE-2021-36530 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.