HOMEVULNERABILITIESCVE-2021-3421
MEDIUM

CVE-2021-3421

CWE-347Published: May 19, 2021· Updated: Jun 17, 2026

5.5
CVSS v3.1

Official Description

A flaw was found in the RPM package in the read functionality. This flaw allows an attacker who can convince a victim to install a seemingly verifiable package or compromise an RPM repository, to cause RPM database corruption. The highest threat from this vulnerability is to data integrity. This flaw affects RPM versions before 4.17.0-alpha.

NVD Source

Technical Analysis

CVE-2021-3421 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected Vendors & Products

Fedora1 product(s)
fedora
Red Hat1 product(s)
enterprise linux
rpm1 product(s)
rpm
Source: NVD CPE · 5 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

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1927747
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1927747
ADVISORYhttps://security.gentoo.org/glsa/202107-43
ADVISORYhttps://security.gentoo.org/glsa/202107-43

All References (10)

→
https://bugzilla.redhat.com/show_bug.cgi?id=1927747Issue Tracking · Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMGXO3W6DHPO62GJ4VVF5DEUX5DRUR5K/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VHRPNBCRPDJHHQE3MBPSZK4H7X2IM7AC/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YILPBTPSBRYL4POBI3F4YUSVPSOQNJBY/
→
https://security.gentoo.org/glsa/202107-43Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1927747Issue Tracking · Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMGXO3W6DHPO62GJ4VVF5DEUX5DRUR5K/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VHRPNBCRPDJHHQE3MBPSZK4H7X2IM7AC/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YILPBTPSBRYL4POBI3F4YUSVPSOQNJBY/
→
https://security.gentoo.org/glsa/202107-43Third Party Advisory

Quick Facts

CVE IDCVE-2021-3421
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-347
CISA KEVNo
Affected3 vendor(s)
PublishedMay 19, 2021

Related CVEs (CWE-347)

CVE-2024-32962
10.0
CVE-2026-56451
10.0
CVE-2026-48558
KEV10.0
CVE-2026-44748
9.9
CVE-2014-3585
9.8
CVE-2017-18146
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-3421 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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