Improper verification of vryptographic signature in rpm

Published: 2022-01-25 | Updated: 2022-02-22
Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE-ID CVE-2021-3521
Exploitation vector Network
Public exploit N/A
Vulnerable software

Vendor rpm-software-management

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU59993

Risk: Medium

CVSSv3.1: 6.8 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-3521

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No


The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to an error in RPM's signature functionality, as RPM does not check the binding signature of subkeys before importing them. A remote attacker with ability to add malicious subkey to a legitimate public key can run malicious code on the system.


Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

rpm: 4.0 - 4.17.0 rc1

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.