Use After Free
CWE-416
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.
We track 4,465 vulnerabilities of this type. 100% are rated high or critical, and the average CVSS score is 8.3. 109 have been exploited in real attacks.
How this weakness is prevented
- Architecture and Design: Choose a language that provides automatic memory management.
- Implementation: When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
Latest Use After Free vulnerabilities
- 8.1 High severity
OpenVPN: Use After Free
An incomplete guard in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote authenticated peers to trigger a use-after-free during TLS session promotion, potentially leading to a denial of service or memory leakage
- 8.1 High severity
OpenVPN: Out-of-bounds Read
A use-after-free in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote authenticated peers to potentially cause a denial of service or leak memory via crafted packets during TLS session promotion or expiry
- 8.8 High severity
Chrome: Use After Free
Use after free in Dawn in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Low)
- 8.8 High severity
Chrome: Use After Free
Use after free in PDFium in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted PDF file. (Chromium security severity: Low)
- 8.8 High severity
Chrome: Use After Free
Use after free in Chrome for iOS in Google Chrome on iOS prior to 151.0.7922.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Low)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in WebSockets in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Low)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in DNS in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Low)
- 8.8 High severity
Chrome: Use After Free
Use after free in V8 in Google Chrome prior to 151.0.7922.72 allowed an attacker who convinced a user to install a malicious extension to execute arbitrary code inside a sandbox via a crafted Chrome Extension. (Chromium security severity: Low)
- 8.8 High severity
Chrome: Use After Free
Use after free in Sync in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Low)
- 7.5 High severity
Chrome: Use After Free
Use after free in DevTools in Google Chrome prior to 151.0.7922.72 allowed an attacker who convinced a user to install a malicious extension to execute arbitrary code inside a sandbox via a crafted Chrome Extension. (Chromium security severity: Low)
- 7.5 High severity
Chrome: Use After Free
Use after free in DevTools in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Use after free in Views in Google Chrome on Linux prior to 151.0.7922.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)
- 7.5 High severity
Chrome: Use After Free
Use after free in TabStrip in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who convinced a user to engage in specific UI gestures to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Use after free in Enterprise in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Object lifecycle issue in WebRTC in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Integer overflow in WebXR in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Use after free in PDFium in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted PDF file. (Chromium security severity: Medium)
- 7.8 High severity
Chrome: Use After Free
Use after free in Tracing in Google Chrome on Windows prior to 151.0.7922.72 allowed a local attacker to perform OS-level privilege escalation via a malicious file. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Use after free in V8 in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Medium)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in ANGLE in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium)
- 7.1 High severity
Chrome: Use After Free
Use after free in ANGLE in Google Chrome on Windows prior to 151.0.7922.72 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Use after free in V8 in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Medium)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in Media in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Use after free in Audio in Google Chrome on Mac prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Use after free in Extensions in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted Chrome Extension. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Use after free in Views in Google Chrome on Mac prior to 151.0.7922.72 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)
- 7.1 High severity
Chrome: Use After Free
Use after free in ANGLE in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium)
- 8.8 High severity
Chrome: Use After Free
Use after free in V8 in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform out of bounds memory access via a crafted HTML page. (Chromium security severity: Medium)
- 8.3 High severity
Chrome: Use After Free
Use after free in Media in Google Chrome on Windows prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 8.3 High severity
Chrome: Use After Free
Object lifecycle issue in WebView in Google Chrome on Android prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in Input in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in ANGLE in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 8.4 High severity
Chrome: Use After Free
Use after free in Updater in Google Chrome on Mac prior to 151.0.7922.72 allowed a local attacker to perform privilege escalation via malicious network traffic. (Chromium security severity: High)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in Audio in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in ANGLE in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 8.6 High severity
Chrome: Use After Free
Use after free in Views in Google Chrome prior to 151.0.7922.72 allowed a local attacker to potentially perform a sandbox escape via a malicious file. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in DOM in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in DataTransfer in Google Chrome on Windows prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 9.6 Critical severity
Chrome: Use After Free
Use after free in Input in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
- 8.8 High severity
Chrome: Use After Free
Use after free in Autofill in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)