No exploitation reportedFix available

CVE-2021-30560

Q: Is CVE-2021-30560 actively exploited?

Active exploitation of CVE-2021-30560 has not been confirmed. Its EPSS score was 17.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-30560?

CVE-2021-30560 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2021-08-03
Fixed in9.0.6 · 8.2.12
WeaknessCWE-416

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

Use after free in Blink XSLT in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Timeline

dates in UTC

2021-08-0319:15CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 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-2021-30560?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-30560?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Splunk universal forwarder

Branch	Affected	Fixed in	Source
9.0	≥ 9.0.0, < 9.0.6	9.0.6	NVD
8.2	≥ 8.2.0, < 8.2.12	8.2.12	NVD
9.1	= 9.1.0	no fix published	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
10.0	= 10.0	no fix published	NVD
11.0	= 11.0	no fix published	NVD

Google chrome

Branch	Affected	Fixed in	Source
91.0	< 91.0.4472.164	91.0.4472.164	NVD

1 more product in the sources.

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

Fix

Update Splunk universal forwarder to 9.0.6 · 8.2.12

Advisories and patches

chromereleases.googleblog.comRelease Notes · Vendor Advisory
crbug.comPatch · Vendor Advisory

Detection

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

Sources

CISA-ADPSSVC decisionnone2025-04-23
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.18.8read 2026-10-23
NVDCVSS 3.18.8read 2026-10-23
NVDCVSS 2.06.8read 2026-10-23
CISA-ADPweakness (CWE)CWE-416read 2026-10-23
NVDweakness (CWE)CWE-416read 2026-10-23
FIRST EPSSEPSS score17.6 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: 2021-08-03
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-30560?

Use after free in Blink XSLT in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Is CVE-2021-30560 actively exploited?

Active exploitation of CVE-2021-30560 has not been confirmed. Its EPSS score was 17.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-30560?

CVE-2021-30560 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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