CVE-2021-3349Public exploit

Phishing via extrapolated OpenPGP UID trust

Published Feb 1, 2021 · Updated Aug 3, 2024

Sender-identity spoofing in GNOME Evolution 3.38.3 and earlier allows attackers to present forged identities as valid OpenPGP signatures. Evolution combines key-level trust from GnuPG status output with the key's primary UID without retrieving and checking that UID's individual validity. Exploitation requires an attacker-controlled key with an already trusted UID and a recipient who opens the signed message; the issue's significance and correction locus are disputed.

CVSS severity3.3
Low
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Sender-identity spoofing in GNOME Evolution 3.38.3 and earlier allows attackers to present forged identities as valid OpenPGP signatures. Evolution combines key-level trust from GnuPG status output with the key's primary UID without retrieving and checking that UID's individual validity. Exploitation requires an attacker-controlled key with an already trusted UID and a recipient who opens the signed message; the issue's significance and correction locus are disputed.

The record

CVE
CVE-2021-3349
Published
Feb 1, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-345, T1036
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:P/A:N
3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1036Masquerading

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo