CVE-2022-24884Network attack vector

Signature forgery via unchecked zero-valued ECDSA components

Published May 5, 2022 · Updated Apr 23, 2025

Improper ECDSA signature verification in ecdsautils before 0.4.1 allows attackers to forge signatures with all-zero values. The ecdsa_verify_prepare_legacy() path fails to reject zero-valued r or s components, so ecdsa_verify_legacy() accepts a zeroed signature; ecdsa_verify_list_legacy() repeats that false acceptance. Any workflow that trusts the CLI or library acceptance result can treat unauthenticated data as authentic, including n-of-m checks.

CVSS severity10.0
Critical
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper ECDSA signature verification in ecdsautils before 0.4.1 allows attackers to forge signatures with all-zero values. The ecdsa_verify_prepare_legacy() path fails to reject zero-valued r or s components, so ecdsa_verify_legacy() accepts a zeroed signature; ecdsa_verify_list_legacy() repeats that false acceptance. Any workflow that trusts the CLI or library acceptance result can treat unauthenticated data as authentic, including n-of-m checks.

The record

CVE
CVE-2022-24884
Published
May 5, 2022
Updated
Apr 23, 2025
Vendor
Freifunk Gluon
Product
ecdsautils
Classifications
CWE-347, T1553
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record 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=< 0.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Freifunk Gluon · ecdsautilsversion=< 0.4.1

Published CVSS scores

10.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
7.5Canonical Ltd.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1553Subvert Trust Controls

Public exploit references

No public exploit references are available in this record.

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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