How severe is CVE-2021-24377?

CVE-2021-24377 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-24377 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24377?

CVE-2021-24377 affects Autoptimize. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24377?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-24377 published?

CVE-2021-24377 was published on 2021-06-21 and last updated on 2026-06-17.

CVE-2021-24377

CVE-2021-24377 is a high-severity vulnerability in Autoptimize with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-362.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-362
Affected product: Autoptimize
Published: 2021-06-21
Last modified: 2026-06-17

Description

The Autoptimize WordPress plugin before 2.7.8 attempts to remove potential malicious files from the extracted archive uploaded via the 'Import Settings' feature, however this is not sufficient to protect against RCE as a race condition can be achieved in between the moment the file is extracted on the disk but not yet removed. It is a bypass of CVE-2020-24948.

Frequently asked questions

What is CVE-2021-24377?: The Autoptimize WordPress plugin before 2.7.8 attempts to remove potential malicious files from the extracted archive uploaded via the 'Import Settings' feature, however this is not sufficient to protect against RCE as a race condition can be achieved in between the moment the file is extracted on the disk but not yet removed. It is a bypass of CVE-2020-24948.
How severe is CVE-2021-24377?: CVE-2021-24377 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-24377 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24377?: CVE-2021-24377 affects Autoptimize. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24377?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-24377 published?: CVE-2021-24377 was published on 2021-06-21 and last updated on 2026-06-17.

References

https://wpscan.com/vulnerability/85c0a564-2e56-413d-bc3a-1039343207e4

Affected products (1)

cpe:2.3:a:autoptimize:autoptimize:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Autoptimize

CVE-2021-24376 — Critical (CVSS 9.8): The Autoptimize WordPress plugin before 2.7.8 attempts to delete malicious files (such as .php) form the uploaded…
CVE-2020-24948 — High (CVSS 7.2): The ao_ccss_import AJAX call in Autoptimize Wordpress Plugin 2.7.6 does not ensure that the file provided is a…
CVE-2023-2113 — Medium (CVSS 4.8): The Autoptimize WordPress plugin before 3.1.7 does not sanitise and escape the settings imported from a previous…
CVE-2022-2635 — Medium (CVSS 4.8): The Autoptimize WordPress plugin before 3.1.1 does not sanitise and escape some of its settings, which could allow high…
CVE-2021-24378 — Medium (CVSS 4.8): The Autoptimize WordPress plugin before 2.7.8 does not check for malicious files such as .html in the archive uploaded…
CVE-2021-24332 — Medium (CVSS 4.8): The Autoptimize WordPress plugin before 2.8.4 was missing proper escaping and sanitisation in some of its settings,…

All CVEs affecting Autoptimize →

Other CWE-362 (Race Condition) vulnerabilities

CVE-2022-27626 — Critical (CVSS 10.0): A vulnerability regarding concurrent execution using shared resource with improper synchronization ('Race Condition')…
CVE-2015-8556 — Critical (CVSS 10.0): Local privilege escalation vulnerability in the Gentoo QEMU package before 2.5.0-r1.
CVE-2014-0703 — Critical (CVSS 10.0): Cisco Wireless LAN Controller (WLC) devices 7.4 before 7.4.110.0 distribute Aironet IOS software with a race condition…
CVE-2010-1228 — Critical (CVSS 10.0): Multiple race conditions in the sandbox infrastructure in Google Chrome before 4.1.249.1036 have unspecified impact and…
CVE-2008-6598 — Critical (CVSS 10.0): Multiple race conditions in WANPIPE before 3.3.6 have unknown impact and attack vectors related to "bri restart logic."
CVE-2026-46137 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: fix potential…

Browse all CWE-362 (Race Condition) vulnerabilities →