9.6

CVE-2021-21111: debian debian_linux

Modified
AliasesUBUNTU-CVE-2021-21111DEBIAN-CVE-2021-21111
Published 08-01-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-21111 is a critical (CVSS 9.6) vulnerability in debian debian_linux. EPSS estimates a 1.08% chance of exploitation in the next 30 days, higher than 65% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.6 (NVD); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.6/10
010
Critical · v3.1 (NVD)
EPSS score
1.08%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 8
DSA-4832-1OPENSUSE-SU-2021:0040-1OPENSUSE-SU-2021:0041-1OPENSUSE-SU-2021:0047-1OPENSUSE-SU-2021:0048-1OPENSUSE-SU-2021:0138-1

Timeline

  1. 08-01-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

Insufficient policy enforcement in WebUI in Google Chrome prior to 87.0.4280.141 allowed an attacker who convinced a user to install a malicious extension to potentially perform a sandbox escape via a crafted Chrome Extension.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.08%

Chance of exploitation in the next 30 days

Percentile

65%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.08% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Debian2 products
Fedoraproject1 product
Google1 product
  • chrome≥ unspecified, < 87.0.4280.141 | < 87.0.4280.141
Ubuntu1 product
  • chromium-browser< 89.0.4389.82-0ubuntu0.16.04.1 | < 89.0.4389.82-0ubuntu0.18.04.1

4 vendors · 5 products

References

9 links