How severe is CVE-2021-40895?

CVE-2021-40895 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-40895 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40895?

CVE-2021-40895 affects Todo-regex Project Todo-regex. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40895?

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-2021-40895 published?

CVE-2021-40895 was published on 2022-06-27 and last updated on 2026-06-17.

CVE-2021-40895

CVE-2021-40895 is a high-severity vulnerability in Todo-regex Project Todo-regex with a CVSS 3.x base score of 7.5. 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-1333.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1333
Affected product: Todo-regex Project Todo-regex
Published: 2022-06-27
Last modified: 2026-06-17

Description

A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in todo-regex v0.1.1 when matching crafted invalid TODO statements.

Frequently asked questions

What is CVE-2021-40895?: A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in todo-regex v0.1.1 when matching crafted invalid TODO statements.
How severe is CVE-2021-40895?: CVE-2021-40895 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-40895 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40895?: CVE-2021-40895 affects Todo-regex Project Todo-regex. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40895?: 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-2021-40895 published?: CVE-2021-40895 was published on 2022-06-27 and last updated on 2026-06-17.

References

https://github.com/yetingli/SaveResults/blob/main/js/todo-regex.js

Affected products (1)

cpe:2.3:a:todo-regex_project:todo-regex:0.1.1:*:*:*:*:node.js:*:*

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