CVE-2023-20540
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Timing Discrepancy in ASP Allows Brute-Force Attack

Vulnerability report for CVE-2023-20540, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-06-26

Last updated on: 2026-06-26

Assigner: Advanced Micro Devices Inc.

Description

An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity.

CVSS Scores

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Meta Information

Published
2026-06-26
Last Modified
2026-06-26
Generated
2026-07-17
AI Q&A
2026-06-26
EPSS Evaluated
2026-07-15
NVD
EUVD

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-208 Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.

Attack-Flow Graph

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Executive Summary

This vulnerability involves an observable timing discrepancy in the ASP (presumably a software component) that could allow a privileged attacker to perform a brute-force attack against the hash message authentication code (HMAC).

By exploiting this timing difference, the attacker could input arbitrary messages and potentially compromise the integrity of the data.

Impact Analysis

The vulnerability could lead to a loss of data integrity because an attacker might be able to manipulate or forge messages by exploiting the timing discrepancy to brute-force the HMAC.

This means that trusted data could be altered or corrupted without detection, potentially affecting the reliability and security of systems relying on this component.

Compliance Impact

This vulnerability could potentially lead to a loss of data integrity due to a brute-force attack on the hash message authentication code. Loss of data integrity may impact compliance with standards and regulations such as GDPR and HIPAA, which require protection of data integrity and security.

However, no specific information is provided about direct effects on compliance with these standards.

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