CVE-2019-14855Public exploitNetwork attack vector

Key certification forgery via SHA-1 collisions

Published Mar 20, 2020 · Updated Aug 5, 2024

Signature forgery in GnuPG before 2.2.18 allows attackers to make colliding SHA-1 key certifications appear valid. Web-of-Trust validation accepts SHA-1 identity signatures whose chosen-prefix collisions let a certification transfer between keys with different identities. Exploitation requires crafted colliding key material and reliance on the resulting certification; GnuPG 2.x does not create SHA-1 signatures by default.

CVSS severity7.5
High
EPSS probability1.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Signature forgery in GnuPG before 2.2.18 allows attackers to make colliding SHA-1 key certifications appear valid. Web-of-Trust validation accepts SHA-1 identity signatures whose chosen-prefix collisions let a certification transfer between keys with different identities. Exploitation requires crafted colliding key material and reliance on the resulting certification; GnuPG 2.x does not create SHA-1 signatures by default.

The record

CVE
CVE-2019-14855
Published
Mar 20, 2020
Updated
Aug 5, 2024
Vendor
Red Hat
Product
GnuPG 2
Classifications
CWE-326
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.2.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · GnuPG 2version=2.2.18

Published CVSS scores

5.3Red HatCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/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.

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No observations available

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

Weakness, pattern, technique

CWE-326Inadequate Encryption Strength

Public exploit references

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

Technologies

Your stack

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Your stack

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