CVE-2024-23680Network attack vector

Non-repudiation bypass via invalid ECDSA signature acceptance

Published Jan 19, 2024 · Updated Jul 14, 2026

Improper signature verification in AWS Encryption SDK for Java before 1.9.0 and 2.0.0 through 2.1.x allows attackers to pass invalid signatures. During message decryption, the SDK's ECDSA verification path treats certain invalid signatures as valid instead of rejecting the message. Exploitation requires trusted KMS decrypt permissions; it can defeat signature-based non-repudiation but cannot alter authenticated ciphertext or decrypted plaintext.

CVSS severity5.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in AWS Encryption SDK for Java before 1.9.0 and 2.0.0 through 2.1.x allows attackers to pass invalid signatures. During message decryption, the SDK's ECDSA verification path treats certain invalid signatures as valid instead of rejecting the message. Exploitation requires trusted KMS decrypt permissions; it can defeat signature-based non-repudiation but cannot alter authenticated ciphertext or decrypted plaintext.

The record

CVE
CVE-2024-23680
Published
Jan 19, 2024
Updated
Jul 14, 2026
Vendor
Amazon Web Services
Product
AWS Encryption SDK for Java
Classifications
CWE-347
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record 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 <1.9.0
  2. Affected versionversion=2.0.0 <2.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Amazon Web Services · AWS Encryption SDK for Javaversion=0 <1.9.0; version=2.0.0 <2.2.0

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
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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