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CVE-2021-38003

HIGH 8.8 KNOWN EXPLOITED PoC CATALOGUED ALL-YEARS

Published 2021-11-23 · Last modified 2025-10-21 · Chrome · NVD: Analyzed

Inappropriate implementation in V8 in Google Chrome prior to 95.0.4638.69 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2021-11-03. Patch or mitigate now.

Exploitation likelihood

38.6%chance of exploitation in 30 days · 99th percentile

● In CISA KEV (2021-11-03)● Catalogued PoC◆ SSVC: exploitation active, automatable no

Impact if exploited

8.8CVSS 3.1 · HIGH · ADP

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ⚠User interaction: A user must take an action (click / open a file)
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

Public PoC or exploit resources are catalogued below.

Listed by the named source; Vulnpedia has not tested these resources.

PoC data: JSON

Resource commands

curl -s https://vulnpedia.com/cve/CVE-2021-38003/poc.jsonMachine-readable PoC index for this CVE (for automation).

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Google Fedoraproject Debian

Products Chrome Fedora Debian Linux

Weakness (CWE)

  • CWE-755: Improper Handling of Exceptional Conditions

CVSS vector

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

References and research data (JSON)

Vendor product assessments

  • All currently supported Red Hat products · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    Red Hat · CVE-2021-38003 · Updated 2025-11-21T13:55:22+00:00

Unverified PoC candidates

Catalogue matches for further research. These repositories have not been validated as working exploits.

2 candidates

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

Known Affected Software Configurations

VendorProductVersion range
GoogleChrome< 95.0.4638.69
FedoraprojectFedora34
DebianDebian Linux10.0
DebianDebian Linux11.0

All CVSS metrics

  • HIGH 8.8 v3.1 · ADP Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  • HIGH 8.8 v3.1 · NVD Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  • MEDIUM 6.8 v2.0 · NVD Primary
    AV:N/AC:M/Au:N/C:P/I:P/A:P

References

Exploit-tagged references (not proof of a PoC)

  • https://crbug.com/1263462 x_refsource_MISCx_transferredExploitIssue TrackingCVE record · Chrome · Updated 2022-01-15T14:08:16.000Z
    CVE record · CVE · Updated 2024-08-04T01:30:09.213Z
    NVD · CVE-2021-38003 · Updated 2026-06-17T04:01:23.563

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS