HOMEVULNERABILITIESCVE-2021-3445
HIGH

CVE-2021-3445

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

7.5
CVSS v3.1

Official Description

A flaw was found in libdnf's signature verification functionality in versions before 0.60.1. This flaw allows an attacker to achieve code execution if they can alter the header information of an RPM package and then trick a user or system into installing it. The highest risk of this vulnerability is to confidentiality, integrity, as well as system availability.

NVD Source

Technical Analysis

CVE-2021-3445 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

Fedora1 product(s)
fedora
Red Hat1 product(s)
enterprise linux
rpm1 product(s)
libdnf
Source: NVD CPE · 4 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://bugzilla.redhat.com/show_bug.cgi?id=1932079
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1932079

All References (6)

→
https://bugzilla.redhat.com/show_bug.cgi?id=1932079Issue Tracking · Mitigation · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DPMFGGQ5T6WVFTFX3OKMVTTM5O4EXWZR/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4NL7TNWAHJ6JVRABQUPWHKKCTHUZMNF/
→
https://bugzilla.redhat.com/show_bug.cgi?id=1932079Issue Tracking · Mitigation · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DPMFGGQ5T6WVFTFX3OKMVTTM5O4EXWZR/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4NL7TNWAHJ6JVRABQUPWHKKCTHUZMNF/

Quick Facts

CVE IDCVE-2021-3445
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-347
CISA KEVNo
Affected3 vendor(s)
PublishedMay 19, 2021

Related CVEs (CWE-347)

CVE-2026-48558
KEV10.0
CVE-2024-32962
10.0
CVE-2026-56451
10.0
CVE-2026-44748
9.9
CVE-2017-18146
9.8
CVE-2018-1000076
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-3445 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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