Weakness (CWE)
CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.
How to prevent it (7 mitigations)
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Implementation
The most basic advice for TOCTOU vulnerabilities is to not perform a check before the use. This does not resolve the underlying issue of the execution of a function on a resource whose state and identity cannot be assured, but it does help to limit the false sense of security given by the check.
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Implementation
When the file being altered is owned by the current user and group, set the effective gid and uid to that of the current user and group when executing this statement.
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Architecture and Design
Limit the interleaving of operations on files from multiple processes.
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Implementation, Architecture and Design
If you cannot perform operations atomically and you must share access to the resource between multiple processes or threads, then try to limit the amount of time (CPU cycles) between the check and use of the resource. This will not fix the problem, but it could make it more difficult for an attack to succeed.
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Implementation
Recheck the resource after the use call to verify that the action was taken appropriately.
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Architecture and Design
Ensure that some environmental locking mechanism can be used to protect resources effectively.
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Implementation
Ensure that locking occurs before the check, as opposed to afterwards, such that the resource, as checked, is the same as it is when in use.
Source: MITRE CWE-367
427 results · Clear filters · Feed
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High 7.5CVE-2026-30332 Public exploit
A Time-of-Check to Time-of-Use (TOCTOU) race condition vulnerability in Balena Etcher for Windows prior to v2.1.4 allow…
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High 7.5
OpenClaw < 2026.3.11 - Sandbox Boundary Bypass via Unvalidated Temporary File Creation
OpenClaw before 2026.3.11 contains a sandbox boundary bypass vulnerability in fs-bridge staged writes where temporary file creation and population are not pinned to a verified parent directory. Attackers can exploit a race condition in parent-path alias chang…
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High 7.3
OpenClaw < 2026.3.11 - Unbound Interpreter and Runtime Commands Bypass in node-host Approval
OpenClaw before 2026.3.11 contains an approval integrity vulnerability allowing attackers to execute rewritten local code by modifying scripts between approval and execution when exact file binding cannot occur. Remote attackers can change approved local scri…
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High 7.8
Use after free of paging structures in EPT
The Intel EPT paging code uses an optimization to defer flushing of any cached EPT state until the p2m lock is dropped, so that multiple modifications done under the same locked region only issue a single flush. Freeing of paging structures however is not def…
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High 7.6
OpenClaw < 2026.3.2 - DNS Pinning Bypass via Environment Proxy Configuration in web_fetch
OpenClaw versions prior to 2026.3.2 contain a DNS pinning bypass vulnerability in strict URL fetch paths that allows attackers to circumvent SSRF guards when environment proxy variables are configured. When HTTP_PROXY, HTTPS_PROXY, or ALL_PROXY environment va…
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High 7.0
OpenClaw: Sandbox dangling-symlink alias handling could bypass workspace-only write boundary
### Summary A sandbox boundary-validation gap in symlink alias handling allowed certain workspace-only write paths to be treated as in-boundary even when they could resolve outside the workspace/sandbox root. ### Affected Packages / Versions - Package: npm `o…
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High 7.1
Time-of-check time-of-use race condition in the WheaERST SMM module for some Intel(R) reference platforms may allow an …
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High 8.2
Sylius has a Promotion Usage Limit Bypass via Race Condition
Sylius is an Open Source eCommerce Framework on Symfony. A Time-of-Check To Time-of-Use (TOCTOU) race condition was discovered in the promotion usage limit enforcement. The same class of vulnerability affects the promotion usage limit (the global used counter…
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High 7.3
CODESYS Installer TOCTOU Privilege Escalation
If a legitimate user confirms a self-update prompt or initiate an installation of a CODESYS Development System, a low privileged local attacker can gain elevated rights due to a TOCTOU vulnerability in the CODESYS installer.
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High 7.7
CoreDNS ACL Bypass
CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a logical vulnerability in CoreDNS allows DNS access controls to be bypassed due to the default execution order of plugins. Security plugins such as acl are evaluated before the rewrite plu…
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High 7.8
Avira Internet Security Optimizer TOCTOU
Avira Internet Security contains a time-of-check time-of-use (TOCTOU) vulnerability in the Optimizer component. A privileged service running as SYSTEM identifies directories for cleanup during a scan phase and subsequently deletes them during a separate clean…
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High —
OpenClaw: Sandbox media TOCTOU could read files outside sandbox root
### Summary Sandbox media handling had a time-of-check/time-of-use gap: media paths could be validated first and read later through a separate path. A symlink retarget between those steps could cause reads outside `sandboxRoot`. ### Impact Affected versions c…
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High —
OpenClaw's TOCTOU symlink race in writeFileWithinRoot could create or truncate files outside root boundaries
### Summary A symlink-retarget TOCTOU race in `writeFileWithinRoot` could point an attacker-controlled path alias outside the configured root between resolution and write operations. ### Impact Affected versions could cause out-of-root write side effects (inc…
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High 7.0
Craft CMS has Cloud Metadata SSRF Protection Bypass via DNS Rebinding
Craft is a content management system (CMS). In versions 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22, the SSRF validation in Craft CMS’s GraphQL Asset mutation performs DNS resolution separately from the HTTP request. This Time-of-Check-Time-of-Use …
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High 8.5
Intego Log Reporter TOCTOU Local Privilege Escalation
Intego Log Reporter, a macOS diagnostic utility bundled with Intego security products that collects system and application logs for support analysis, contains a local privilege escalation vulnerability. A root-executed diagnostic script creates and writes fil…
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High 7.1
A Time-of-check time-of-use (TOCTOU) race condition in the AMD Secure Processor (ASP) could allow an attacker to corrup…
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High 7.1
A Time-of-check time-of-use (TOCTOU) race condition in the AMD Secure Processor (ASP) could allow an attacker to modify…
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High 7.8
Windows HTTP.sys Elevation of Privilege Vulnerability
Time-of-check time-of-use (toctou) race condition in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.
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High 8.0
GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability
Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute code over a network.
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High 8.3
Local privilege escalation in ESET Management Agent for Windows
Local privilege escalation vulnerability via insecure temporary batch file execution in ESET Management Agent
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High 7.1
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. From version 1.10.0 to 1.25.3, cross-client response data leak when a single McpServer/Server and transport instance is reused across multiple client connections…
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High 7.3
BuhoCleaner 1.15.2 - Local Privilege Escalation via PID reuse attack
BuhoCleaner contains an insecure XPC service that allows local, unprivileged users to escalate their privileges to root via insecure functions.This issue affects BuhoCleaner: 1.15.2.
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High 7.8
XPC Client Validation via PID leading to Local Privilege Escalation in Native Instruments Native Access
It was found that the XPC service offered by the privileged helper of Native Access uses the PID of the connecting client to verify its code signature. This is considered insecure and can be exploited by PID reuse attacks. The connection handler function uses…
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High 7.3
Rufus has Local Privilege Escalation via TOCTOU Race Condition in Fido Script Handling
Rufus is a utility that helps format and create bootable USB flash drives. Versions 4.11 and below contain a race condition (TOCTOU) in src/net.c during the creation, validation, and execution of the Fido PowerShell script. Since Rufus runs with elevated priv…
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High 8.8
node-tar has Race Condition in Path Reservations via Unicode Ligature Collisions on macOS APFS
node-tar,a Tar for Node.js, has a race condition vulnerability in versions up to and including 7.5.3. This is due to an incomplete handling of Unicode path collisions in the `path-reservations` system. On case-insensitive or normalization-insensitive filesyst…
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High 7.8
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Time-of-check time-of-use (toctou) race condition in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
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High 7.8
Windows Installer Elevation of Privilege Vulnerability
Time-of-check time-of-use (toctou) race condition in Windows Installer allows an authorized attacker to elevate privileges locally.
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High 7.8
Windows Kernel Memory Elevation of Privilege Vulnerability
Time-of-check time-of-use (toctou) race condition in Windows Kernel Memory allows an authorized attacker to elevate privileges locally.
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High 7.0
A local privilege escalation vulnerability exists in SevenCs ORCA G2 2.0.1.35 (EC2007 Kernel v5.22). The flaw is a Time…
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High 7.7
Multiple Vulnerabilities in IBM Concert Software.
IBM Concert 1.0.0 through 2.1.0 could allow a local user to escalate their privileges due to a race condition of a symbolic link.
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High 8.5
Versa SASE Client for Windows < 7.9.5 Arbitrary Folder Deletion Leading to Local Privilege Escalation
Versa SASE Client for Windows versions released between 7.8.7 and 7.9.4 contain a local privilege escalation vulnerability in the audit log export functionality. The client communicates user-controlled file paths to a privileged service, which performs file s…
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High 7.5
BullWall Server Intrusion Protection (SIP) initialization race condition
BullWall Server Intrusion Protection (SIP) services are initialized after login services during system startup. A local, authenticated attacker can log in after boot and before SIP MFA is running. The SIP services do not retroactively enforce MFA or disconnec…
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High 7.5
BullWall Server Intrusion Protection RDP MFA connection delay
BullWall Server Intrusion Protection has a noticeable configuration-dependent delay before the MFA check for RDP connections. A remote, authenticated attacker can potentially bypass detection during this delay. Versions 4.6.0.0, 4.6.0.6, 4.6.0.7, and 4.6.1.4 …
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High 7.7
Time-of-check Time-of-use (TOCTOU) Race Condition in GitLab
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.4 prior to 18.4.5, 18.5 prior to 18.5.3, and 18.6 prior to 18.6.1 that could have allowed an authenticated user to obtain credentials from higher-privileged users and perform action…
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High 7.4
GPU DDK - TOCTOU bug affecting psFWMemContext->uiPageCatBaseRegSet
Kernel or driver software installed on a Guest VM may post improper commands to the GPU Firmware to exploit a TOCTOU race condition and trigger a read and/or write of data outside the allotted memory escaping the virtual machine.
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High 7.3
Nagios XI < 2011R1.9 Race Conditions in Crontab Install Scripts LPE
Nagios XI versions prior to 2011R1.9 contain privilege escalation vulnerabilities in the scripts that install or update system crontab entries. Due to time-of-check/time-of-use race conditions and missing synchronization or final-path validation, a local low-…
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High 7.0
Microsoft Defender for Linux Denial of Service Vulnerability
Time-of-check time-of-use (toctou) race condition in Microsoft Defender for Linux allows an authorized attacker to deny service locally.
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High 7.0
Windows Graphics Component Elevation of Privilege Vulnerability
Time-of-check time-of-use (toctou) race condition in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.
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High 7.8
NtQueryInformation Token function (ntifs.h) Elevation of Privilege Vulnerability
Time-of-check time-of-use (toctou) race condition in NtQueryInformation Token function (ntifs.h) allows an authorized attacker to elevate privileges locally.
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High 7.8
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Time-of-check time-of-use (toctou) race condition in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.