How severe is CVE-2021-28300?

CVE-2021-28300 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-28300 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28300?

CVE-2021-28300 affects Gpac. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28300?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-28300 published?

CVE-2021-28300 was published on 2021-04-14 and last updated on 2026-06-17.

CVE-2021-28300

CVE-2021-28300 is a critical-severity vulnerability in Gpac with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Gpac
Published: 2021-04-14
Last modified: 2026-06-17

Description

NULL Pointer Dereference in the "isomedia/track.c" module's "MergeTrack()" function of GPAC v0.5.2 allows attackers to execute arbitrary code or cause a Denial-of-Service (DoS) by uploading a malicious MP4 file.

Frequently asked questions

What is CVE-2021-28300?: NULL Pointer Dereference in the "isomedia/track.c" module's "MergeTrack()" function of GPAC v0.5.2 allows attackers to execute arbitrary code or cause a Denial-of-Service (DoS) by uploading a malicious MP4 file.
How severe is CVE-2021-28300?: CVE-2021-28300 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-28300 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28300?: CVE-2021-28300 affects Gpac. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28300?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-28300 published?: CVE-2021-28300 was published on 2021-04-14 and last updated on 2026-06-17.

References

https://github.com/gpac/gpac/issues/1702

Affected products (1)

cpe:2.3:a:gpac:gpac:0.5.2:*:*:*:*:*:*:*

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