HOMEVULNERABILITIESCVE-2021-3565
MEDIUM

CVE-2021-3565

CWE-665Published: June 4, 2021· Updated: Jun 17, 2026

5.9
CVSS v3.1

Official Description

A flaw was found in tpm2-tools in versions before 5.1.1 and before 4.3.2. tpm2_import used a fixed AES key for the inner wrapper, potentially allowing a MITM attacker to unwrap the inner portion and reveal the key being imported. The highest threat from this vulnerability is to data confidentiality.

NVD Source

Technical Analysis

CVE-2021-3565 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), with a CVSS base score of 5.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

Fedora1 product(s)
fedora
Red Hat1 product(s)
enterprise linux
tpm2-tools_project1 product(s)
tpm2-tools
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
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Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1964427
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1964427

All References (6)

→
https://bugzilla.redhat.com/show_bug.cgi?id=1964427Issue Tracking · Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ESY6HRYUKR5ZG2K5QAJQC5S6HMKZMFK7/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XK5M7I66PBXSN663TSLAZ3V6TWWFCV7C/
→
https://bugzilla.redhat.com/show_bug.cgi?id=1964427Issue Tracking · Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ESY6HRYUKR5ZG2K5QAJQC5S6HMKZMFK7/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XK5M7I66PBXSN663TSLAZ3V6TWWFCV7C/

Quick Facts

CVE IDCVE-2021-3565
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-665
CISA KEVNo
Affected3 vendor(s)
PublishedJun 4, 2021

Related CVEs (CWE-665)

CVE-2023-20591
10.0
CVE-2019-10196
9.8
CVE-2022-0947
9.8
CVE-2015-8367
9.8
CVE-2008-0062
9.8
CVE-2021-41264
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-3565 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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