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NVD / CVE Program· CNA Chrome

CVE-2021-37967: Inappropriate implementation in Background Fetch API in Google Chrome prior to 94.0.4606.54 allowed a remote attacker who had compromised…

MediumCVSS 4.3 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 17/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.79% (FIRST EPSS); higher than 56.8% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: qt5-qtwebengine (Alpine:v3.14) 5.15.3_git20211006-r1; qt5-qtwebengine (Alpine:v3.15) 5.15.3_git20211006-r3; chromium (Debian:11) 97.0.4692.71-0.1~deb11u1.

Low priority for now. Upgrade to qt5-qtwebengine (Alpine:v3.14) 5.15.3_git20211006-r1; qt5-qtwebengine (Alpine:v3.15) 5.15.3_git20211006-r3; chromium (Debian:11) 97.0.4692.71-0.1~deb11u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Inappropriate implementation in Background Fetch API in Google Chrome prior to 94.0.4606.54 allowed a remote attacker who had compromised the renderer process to leak cross-origin data via a crafted HTML page.

Published
Oct 8, 2021
Updated
Jun 17, 2026
EPSS
0.7% · 56th percentile

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-37967

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
googlechrome
fedoraprojectfedora
debiandebian linux

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Chrome). Independent of NVD's CPE analysis and usually ahead of it.

  • Google Chrome

    • unspecified and later · before 94.0.4606.54affected
Affected versions · NVD (5)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • debian debian linux11.0
  • fedoraproject fedora33
  • fedoraproject fedora35
  • google chromebefore 94.0.4606.54

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.14qt5-qtwebenginebefore 5.15.3_git20211006-r15.15.3_git20211006-r1
Alpine:v3.15qt5-qtwebenginebefore 5.15.3_git20211006-r35.15.3_git20211006-r3
Debian:11chromiumbefore 97.0.4692.71-0.1~deb11u197.0.4692.71-0.1~deb11u1
Debian:12chromiumbefore 97.0.4692.71-0.197.0.4692.71-0.1
openSUSE:Leap 15.2chromiumbefore 94.0.4606.81-lp152.2.132.194.0.4606.81-lp152.2.132.1
openSUSE:Leap 15.3chromiumbefore 94.0.4606.71-bp153.2.31.194.0.4606.71-bp153.2.31.1
openSUSE:Tumbleweedchromiumbefore 94.0.4606.71-1.194.0.4606.71-1.1
SUSE:Package Hub 15 SP3chromiumbefore 94.0.4606.71-bp153.2.31.194.0.4606.71-bp153.2.31.1

Same product

google: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-4863Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker to perform an out of…KEV
    95Now
  • CVE-2021-21224Type confusion in V8 in Google Chrome prior to 90.0.4430.85 allowed a remote attacker to execute arbitrary code inside a sandbox via a…KEV
    90Now
  • CVE-2018-17463Incorrect side effect annotation in V8 in Google Chrome prior to 70.0.3538.64 allowed a remote attacker to execute arbitrary code inside a…KEV
    90Now

Published before and after this one in the same product

  • ← EarlierCVE-2021-37965Oct 8, 2021 · Inappropriate implementation in Background Fetch API in Google Chrome prior to 94.0.4606.54 allowed a remote attacker to leak cross-origin…
    17Monitor
  • ← EarlierCVE-2021-37966Oct 8, 2021 · Inappropriate implementation in Compositing in Google Chrome on Android prior to 94.0.4606.54 allowed a remote attacker to spoof the…
    17Monitor
  • Later →CVE-2021-37968Oct 8, 2021 · Inappropriate implementation in Background Fetch API in Google Chrome prior to 94.0.4606.54 allowed a remote attacker to leak cross-origin…
    17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:qt5-qtwebengine5.15.3_git20211006-r1 · Alpine:v3.14Package registry (OSV)
debian:chromium97.0.4692.71-0.1 · Debian:12Package registry (OSV)
opensuse:chromium94.0.4606.71-bp153.2.31.1 · openSUSE:Leap 15.3Package registry (OSV)
suse:chromium94.0.4606.71-bp153.2.31.1 · SUSE:Package Hub 15 SP3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-346 · Origin Validation Error

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records