Common Weakness Enumeration

CWE-385

Allowed

Covert Timing Channel

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

Covert timing channels convey information by modulating some aspect of system behavior over time, so that the program receiving the information can observe system behavior and infer protected information.

36 vulnerabilities reference this CWE, most recent first.

CVE-2023-3640 (GCVE-0-2023-3640)

Vulnerability from cvelistv5 – Published: 2023-07-24 15:19 – Updated: 2026-11-09 03:06
VLAI
Title
Kernel: x86/mm: a per-cpu entry area leak was identified through the init_cea_offsets function when prefetchnta and prefetcht2 instructions being used for the per-cpu entry area mapping to the user space
Summary
A possible unauthorized memory access flaw was found in the Linux kernel's cpu_entry_area mapping of X86 CPU data to memory, where a user may guess the location of exception stacks or other important data. Based on the previous CVE-2023-0597, the 'Randomize per-cpu entry area' feature was implemented in /arch/x86/mm/cpu_entry_area.c, which works through the init_cea_offsets() function when KASLR is enabled. However, despite this feature, there is still a risk of per-cpu entry area leaks. This issue could allow a local user to gain access to some important data with memory in an expected location and potentially escalate their privileges on the system.
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-05 18:36 UTC
CWE
Assigner
redhat CNA
References
URL Tags
https://access.redhat.com/errata/RHSA-2023:6583 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2023-3640 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2217523 issue-trackingx_refsource_REDHAT
Impacted products
Date Public
2023-06-23 00:00
Credits
Red Hat would like to thank 77pray (Syclover Security Team) for reporting this issue.
Show details on NVD website
To clipboard 

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CVE-2022-24409 (GCVE-0-2022-24409)

Vulnerability from cvelistv5 – Published: 2022-02-23 21:30 – Updated: 2024-09-17 00:05
VLAI
Summary
Dell BSAFE SSL-J contains remediation for a covert timing channel vulnerability that may be exploited by malicious users to compromise the affected system. Only customers with active BSAFE maintenance contracts can receive details about this vulnerability. Public disclosure of the vulnerability details will be shared at a later date.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
Assigner
dell CNA
References
Impacted products
Vendor Product Version
Dell Dell BSAFE SSL-J Affected: 5.1 , < unspecified (custom)
Affected: unspecified , < 6.4 (custom)
Create a notification for this product.
Date Public
2022-02-15 00:00
Show details on NVD website
To clipboard 

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CVE-2020-35166 (GCVE-0-2020-35166)

Vulnerability from cvelistv5 – Published: 2022-07-11 19:25 – Updated: 2024-09-17 01:56
VLAI
Summary
Dell BSAFE Crypto-C Micro Edition, versions before 4.1.5, and Dell BSAFE Micro Edition Suite, versions before 4.6, contain an Observable Timing Discrepancy Vulnerability.
Severity
5.1 (Medium)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
Assigner
dell CNA
References
Impacted products
Date Public
2019-09-10 18:30
Show details on NVD website
To clipboard 

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CVE-2020-35164 (GCVE-0-2020-35164)

Vulnerability from cvelistv5 – Published: 2022-07-11 19:25 – Updated: 2024-09-16 20:51
VLAI
Summary
Dell BSAFE Crypto-C Micro Edition, versions before 4.1.5, and Dell BSAFE Micro Edition Suite, versions before 4.6, contain an Observable Timing Discrepancy Vulnerability.
Severity
6.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
Assigner
dell CNA
References
Impacted products
Vendor Product Version
Dell Dell BSAFE Crypto-C Micro Edition Affected: unspecified , < 4.1.5 and 4.6 (custom)
Create a notification for this product.
Date Public
2020-07-06 00:00
Show details on NVD website
To clipboard 

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CVE-2020-29506 (GCVE-0-2020-29506)

Vulnerability from cvelistv5 – Published: 2022-07-11 19:25 – Updated: 2024-09-17 00:06
VLAI
Summary
Dell BSAFE Crypto-C Micro Edition, versions before 4.1.5, and Dell BSAFE Micro Edition Suite, versions before 4.5.2, contain an Observable Timing Discrepancy Vulnerability.
Severity
6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CWE
Assigner
dell CNA
References
Impacted products
Vendor Product Version
Dell Dell BSAFE Crypto-C Micro Edition Affected: unspecified , < 4.1.5 and 4.6 (custom)
Create a notification for this product.
Date Public
2020-07-06 00:00
Show details on NVD website
To clipboard 

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CVE-2020-25659 (GCVE-0-2020-25659)

Vulnerability from cvelistv5 – Published: 2021-01-11 15:37 – Updated: 2024-08-04 15:40
VLAI
Summary
python-cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA decryption API, via timed processing of valid PKCS#1 v1.5 ciphertext.
Severity
No CVSS data available.
CWE
Assigner
redhat CNA
References
Impacted products
Vendor Product Version
n/a python-cryptography Affected: python-cryptography 3.2
Show details on NVD website
To clipboard 

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CVE-2020-25658 (GCVE-0-2020-25658)

Vulnerability from cvelistv5 – Published: 2020-11-12 13:48 – Updated: 2024-08-04 15:40
VLAI
Summary
It was found that python-rsa is vulnerable to Bleichenbacher timing attacks. An attacker can use this flaw via the RSA decryption API to decrypt parts of the cipher text encrypted with RSA.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
Assigner
redhat CNA
References
Impacted products
Vendor Product Version
Sybren A. Stüvel python-rsa Affected: after 3.0 (inclusive)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2020-25657 (GCVE-0-2020-25657)

Vulnerability from cvelistv5 – Published: 2021-01-12 14:33 – Updated: 2024-08-04 15:40
VLAI
Summary
A flaw was found in all released versions of m2crypto, where they are vulnerable to Bleichenbacher timing attacks in the RSA decryption API via the timed processing of valid PKCS#1 v1.5 Ciphertext. The highest threat from this vulnerability is to confidentiality.
Severity
No CVSS data available.
CWE
Assigner
redhat CNA
References
Impacted products
Vendor Product Version
n/a m2crypto Affected: All released versions of m2crypto
Show details on NVD website
To clipboard 

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CVE-2020-14341 (GCVE-0-2020-14341)

Vulnerability from cvelistv5 – Published: 2021-01-12 14:23 – Updated: 2024-08-04 12:39
VLAI
Summary
The "Test Connection" available in v7.x of the Red Hat Single Sign On application console can permit an authorized user to cause SMTP connections to be attempted to arbitrary hosts and ports of the user's choosing, and originating from the RHSSO installation. By observing differences in the timings of these scans, an attacker may glean information about hosts and ports which they do not have access to scan directly.
Severity
No CVSS data available.
CWE
Assigner
redhat CNA
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2019-19338 (GCVE-0-2019-19338)

Vulnerability from cvelistv5 – Published: 2020-07-13 16:04 – Updated: 2024-08-05 02:16
VLAI
Summary
A flaw was found in the fix for CVE-2019-11135, in the Linux upstream kernel versions before 5.5 where, the way Intel CPUs handle speculative execution of instructions when a TSX Asynchronous Abort (TAA) error occurs. When a guest is running on a host CPU affected by the TAA flaw (TAA_NO=0), but is not affected by the MDS issue (MDS_NO=1), the guest was to clear the affected buffers by using a VERW instruction mechanism. But when the MDS_NO=1 bit was exported to the guests, the guests did not use the VERW mechanism to clear the affected buffers. This issue affects guests running on Cascade Lake CPUs and requires that host has 'TSX' enabled. Confidentiality of data is the highest threat associated with this vulnerability.
Severity
5.5 (Medium)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
Assigner
redhat CNA
References
Impacted products
Vendor Product Version
[UNKNOWN] Linux Kernel Affected: before 5.5
Create a notification for this product.
Show details on NVD website
To clipboard 

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Mitigation
Architecture and Design

Whenever possible, specify implementation strategies that do not introduce time variances in operations.

Mitigation
Implementation

Often one can artificially manipulate the time which operations take or -- when operations occur -- can remove information from the attacker.

Mitigation
Implementation

It is reasonable to add artificial or random delays so that the amount of CPU time consumed is independent of the action being taken by the application.

CAPEC-462: Cross-Domain Search Timing

An attacker initiates cross domain HTTP / GET requests and times the server responses. The timing of these responses may leak important information on what is happening on the server. Browser's same origin policy prevents the attacker from directly reading the server responses (in the absence of any other weaknesses), but does not prevent the attacker from timing the responses to requests that the attacker issued cross domain.

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