CVE-2022-24771Network attack vector

Signature forgery via lenient DigestInfo validation

Published Mar 18, 2022 · Updated Apr 23, 2025

Improper RSA signature verification in Digital Bazaar Forge before 1.3.0 allows remote attackers to forge signatures with crafted data. The RSA verifier accepts malformed PKCS#1 v1.5 DigestInfo ASN.1 because it does not fully validate the digestAlgorithm structure, leaving encoded-message bytes unchecked. Exploitation requires a low-public-exponent key and lets an unauthenticated attacker make altered content pass signature verification.

CVSS severity7.5
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper RSA signature verification in Digital Bazaar Forge before 1.3.0 allows remote attackers to forge signatures with crafted data. The RSA verifier accepts malformed PKCS#1 v1.5 DigestInfo ASN.1 because it does not fully validate the digestAlgorithm structure, leaving encoded-message bytes unchecked. Exploitation requires a low-public-exponent key and lets an unauthenticated attacker make altered content pass signature verification.

The record

CVE
CVE-2022-24771
Published
Mar 18, 2022
Updated
Apr 23, 2025
Vendor
Digital Bazaar
Product
Forge
Classifications
CWE-347
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 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=< 1.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Digital Bazaar · Forgeversion=< 1.3.0

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS: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.

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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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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