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Fencer Vulns
medium 4.3

CVE-2021-37965 json

Inappropriate implementation in Background Fetch API in Google Chrome prior to 94.0.4606.54 allowed a remote attacker to leak cross-origin…

published 2021-10-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24438

cvss
4.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

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

Patch / fix

  • Google Chrome 94.0.4606.54
  • chromium Debian 14, Debian 13, Debian 12 97.0.4692.71-0.1

debian advisories DEBIAN-CVE-2021-37965

  • chromium-browser Ubuntu 18.04 LTS 94.0.4606.71-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2021-37965

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • chromium openSUSE Tumbleweed 94.0.4606.71-1.1
  • chromium openSUSE Tumbleweed 113.0.5672.92-1.1
  • chromium openSUSE Leap 15.2 94.0.4606.81-lp152.2.132.1
  • chromium Package Hub 15 SP3, openSUSE Leap 15.3 94.0.4606.71-bp153.2.31.1

opensuse advisories openSUSE-SU-2024:11555-1openSUSE-SU-2024:12948-1openSUSE-SU-2021:1350-1openSUSE-SU-2021:1339-1

  • chromium Arch Linux 94.0.4606.54-1
  • vivaldi Arch Linux 4.3.2439.39-1

arch linux advisories AVG-2408AVG-2409

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-37965 updated cvss 6.5

chromium-browser: Inappropriate implementation in Background Fetch API

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.21% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • Google Chrome

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.