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Fencer Intel
high 8.8

CVE-2020-6556 json

Heap buffer overflow in SwiftShader in Google Chrome prior to 84.0.4147.135 allowed a remote attacker to potentially exploit heap corruptio…

published 6y ago modified 4mo ago also EUVD-2020-27705

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

Heap buffer overflow in SwiftShader in Google Chrome prior to 84.0.4147.135 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Patch / fix

  • Google Chrome 84.0.4147.135
  • chromium Debian 14, Debian 13, Debian 12 87.0.4280.88-0.1

debian advisories DEBIAN-CVE-2020-6556

  • chromium-browser Ubuntu 16.04 LTS 85.0.4183.83-0ubuntu0.16.04.2
  • chromium-browser Ubuntu 18.04 LTS 85.0.4183.83-0ubuntu0.18.04.2

ubuntu advisories UBUNTU-CVE-2020-6556

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-browser RHEL 6 EXTRAS 84.0.4147.135-1.el6_10

red hat advisories RHSA-2020:3560

  • chromium openSUSE Tumbleweed 93.0.4577.82-1.1
  • chromium openSUSE Tumbleweed 113.0.5672.92-1.1
  • opera openSUSE Leap 15.2 NonFree, openSUSE Leap 15.1 NonFree 71.0.3770.228-lp152.2.18.1
  • chromium openSUSE Leap 15.2 84.0.4147.135-lp152.2.17.1
  • chromium openSUSE Leap 15.1 84.0.4147.135-lp151.2.120.1

opensuse advisories openSUSE-SU-2024:10681-1openSUSE-SU-2024:12948-1openSUSE-SU-2020:1713-1openSUSE-SU-2020:1263-1openSUSE-SU-2020:1260-1

Is CVE-2020-6556 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2020-6556 updated cvss 8.8

chromium-browser: Heap buffer overflow in SwiftShader

  • Red Hat Enterprise Linux Desktop Supplementary (v. 6) chromium-browser 84.0.4147.135-1.el6_10 Red Hat Enterprise Linux HPC Node Supplementary (v. 6) chromium-browser 84.0.4147.135-1.el6_10 Red Hat Enterprise Linux Server Supplementary (v. 6) chromium-browser 84.0.4147.135-1.el6_10 Red Hat Enterprise Linux Workstation Supplementary (v. 6) chromium-browser 84.0.4147.135-1.el6_10
    fixed: vendor fix RHSA-2020:3560

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

3.29% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

  • Google Chrome

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel 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.