Is CVE-2021-22556 in the CISA KEV catalog?

No. CVE-2021-22556 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22556?

CVE-2021-22556 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-22556?

CVE-2021-22556 has an EPSS score of 0.15% (5th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22556?

Upgrade fuchsia to 4.1 or later.

CVE & CISA-KEV Catalog

CVE-2021-22556

MEDIUM

5.3

CVSS v3

NVD

Description

The Security Team discovered an integer overflow bug that allows an attacker with code execution to issue memory cache invalidation operations on pages that they don’t own, allowing them to control kernel memory from userspace. We recommend upgrading to kernel version 4.1 or beyond.

CWE-190Integer Overflow

How to fix

Remediation Available

fuchsiaNVD

Affected:< 4.1Fixed in:4.1CVE-2021-22556derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.15%probability of exploitation in 30 days

5thpercentile

Low risk: more likely to be exploited than 5% of all known CVEs.

References

Patch1

fuchsia-review.googlesource.com

Vendor Advisory1

fuchsia.dev

Related Vulnerabilities

Other CWE-190 (Integer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix
CVE-2019-11477	High	7.5	99%	-	Fix
CVE-2023-44443	High	7.8	94%	-	Fix
CVE-2014-0569	High	9.3	90%	-	-
CVE-2017-3599	High	7.5	90%	-	Fix
CVE-2023-21716	Critical	9.8	82%	-	Fix

Embed a live status badge for CVE-2021-22556

Markdown

[![CVE-2021-22556](https://tridentstack.com/cve/badge/CVE-2021-22556.svg)](https://tridentstack.com/cve/CVE-2021-22556)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-22556"><img src="https://tridentstack.com/cve/badge/CVE-2021-22556.svg" alt="CVE-2021-22556"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.