HOMEVULNERABILITIESCVE-2021-27419
CRITICAL

CVE-2021-27419

CWE-190Published: May 3, 2022· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

uClibc-ng versions prior to 1.0.37 are vulnerable to integer wrap-around in functions malloc-simple. This improper memory assignment can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

NVD Source

Technical Analysis

CVE-2021-27419 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

uclibc-ng_project1 product(s)
uclibc-ng
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://downloads.uclibc-ng.org/releases/
ADVISORYhttps://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04
ADVISORYhttps://downloads.uclibc-ng.org/releases/
ADVISORYhttps://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04

All References (4)

→
https://downloads.uclibc-ng.org/releases/Product · Release Notes · Vendor Advisory
→
https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04Third Party Advisory · US Government Resource
→
https://downloads.uclibc-ng.org/releases/Product · Release Notes · Vendor Advisory
→
https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2021-27419
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-190
CISA KEVNo
Affected1 vendor(s)
PublishedMay 3, 2022

Related CVEs (CWE-190)

CVE-2012-5835
10.0
CVE-2010-1233
10.0
CVE-2013-2555
10.0
CVE-2015-5108
10.0
CVE-2010-3254
10.0
CVE-2012-5143
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-27419 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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