AMD CPU Speculative Execution timing discrepancy

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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2.6$0-$5k0.00

Summaryinfo

A vulnerability has been found in AMD CPU and classified as problematic. This issue affects some unknown processing of the component Speculative Execution. Performing a manipulation results in timing discrepancy. This vulnerability is reported as CVE-2021-26313. No exploit exists. It is advisable to modify the configuration settings.

Detailsinfo

A vulnerability classified as problematic has been found in AMD CPU (Chip Software) (the affected version unknown). This affects an unknown part of the component Speculative Execution. The manipulation with an unknown input leads to a timing discrepancy vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality.

The weakness was disclosed 06/10/2021. The advisory is shared at amd.com. This vulnerability is uniquely identified as CVE-2021-26313. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 257939 (Linux Distros Unpatched Vulnerability : CVE-2021-26313), which helps to determine the existence of the flaw in a target environment.

It is possible to mitigate the problem by applying the configuration setting .

The vulnerability is also documented in the vulnerability database at Tenable (257939). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 2.6
VulDB Meta Temp Score: 2.6

VulDB Base Score: 2.6
VulDB Temp Score: 2.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Timing discrepancy
CWE: CWE-208 / CWE-203 / CWE-200
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 257939
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-26313

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Config
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/29/2021 🔍
06/10/2021 +131 days 🔍
06/10/2021 +0 days 🔍
08/30/2025 +1542 days 🔍

Sourcesinfo

Advisory: amd.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-26313 (🔍)
GCVE (CVE): GCVE-0-2021-26313
GCVE (VulDB): GCVE-100-176697

Entryinfo

Created: 06/10/2021 09:06
Updated: 08/30/2025 09:41
Changes: 06/10/2021 09:06 (36), 06/12/2021 13:38 (4), 08/30/2025 09:41 (16)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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