No exploitation reportedFix available

CVE-2021-33498

Q: Is CVE-2021-33498 actively exploited?

Active exploitation of CVE-2021-33498 has not been confirmed. Its EPSS score was 1.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-33498?

CVE-2021-33498 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2022-01-15
Fixed in26
WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Pexip Infinity before 26 allows remote denial of service because of missing H.264 input validation (issue 1 of 2).

Timeline

dates in UTC

2022-01-1517:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-33498?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-33498?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Pexip infinity

Branch	Affected	Fixed in	Source
26.x	< 26	26	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Pexip infinity to 26

Advisories and patches

docs.pexip.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score1.2 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2022-01-15
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-33498?

Pexip Infinity before 26 allows remote denial of service because of missing H.264 input validation (issue 1 of 2).

Is CVE-2021-33498 actively exploited?

Active exploitation of CVE-2021-33498 has not been confirmed. Its EPSS score was 1.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-33498?

CVE-2021-33498 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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