CVE-2021-27515

Name: CVE-2021-27515
Creator: NVD / NIST
Published: 2021-02-22T00:15:12.543+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.96%

Last modified Jun 17, 2026

CVE-2021-27515 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. url-parse before 1.5.0 mishandles certain uses of backslash such as http:\/ and interprets the URI as a relative path.. EPSS estimates a 1.96% chance of exploitation in the next 30 days.

Description

url-parse before 1.5.0 mishandles certain uses of backslash such as http:\/ and interprets the URI as a relative path.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

1.96%

77.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Url-Parse Project	Url-Parse	< 1.5.0

References

https://advisory.checkmarx.net/advisory/CX-2021-4306Exploit, Third Party Advisory
https://github.com/unshiftio/url-parse/commit/d1e7e8822f26e8a49794b757123b51386325b2b0Patch, Third Party Advisory
https://github.com/unshiftio/url-parse/compare/1.4.7...1.5.0Patch, Third Party Advisory
https://github.com/unshiftio/url-parse/pull/197Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/02/msg00030.html
https://advisory.checkmarx.net/advisory/CX-2021-4306Exploit, Third Party Advisory
https://github.com/unshiftio/url-parse/commit/d1e7e8822f26e8a49794b757123b51386325b2b0Patch, Third Party Advisory
https://github.com/unshiftio/url-parse/compare/1.4.7...1.5.0Patch, Third Party Advisory
https://github.com/unshiftio/url-parse/pull/197Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/02/msg00030.html

Timeline

Published: Feb 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27515?

url-parse before 1.5.0 mishandles certain uses of backslash such as http:\/ and interprets the URI as a relative path.

How severe is CVE-2021-27515?

CVE-2021-27515 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.96% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27515?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27515?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST