Skip to main content
No exploitation reportedFix available

CVE-2021-27515

No exploitation reported by the sources we read.

  • Published2021-02-22
  • Fixed in1.5.0

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2021-02-2200:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-27515?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-27515?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Url-parse project url-parse
BranchAffectedFixed in
1.5< 1.5.01.5.0
1.5≥ 0.1.0, < 1.5.01.5.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2021-27515 Red Hat Product Security1 product fixed · 2 known affected

    nodejs-url-parse: mishandling certain uses of backslash may lead to confidentiality compromise

    nodejs-url-parse as a component of Red Hat Decision Manager 7 · nodejs-url-parse as a component of Red Hat Process Automation 7

  • RHSA-2021:3917 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Quay v3.6.0 security, bug fix and enhancement update

Full record on NVD

Fix

  1. Update Url-parse project url-parse to 1.5.0
  2. Vendor fix Red Hat Product Security RHSA-2021:3917 · 1 productFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  3. No fix planned, says the vendor Red Hat Product Security CVE-2021-27515 · 2 productsOut of support scope

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.15.3read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • FIRST EPSSEPSS score2.0 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Published
2021-02-22
Last Modified
2026-06-17
NVD 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.

Is CVE-2021-27515 actively exploited?

Active exploitation of CVE-2021-27515 has not been confirmed. Its EPSS score was 2.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-27515?

CVE-2021-27515 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Running url-parse? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, October 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database