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Public proof of conceptFix available

CVE-2021-30151

A public proof of concept exists; no exploitation attested.

  • Published2021-04-06
  • Fixed in6.2.1 · 5.2.0
  • WeaknessCWE-79

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

Sidekiq through 5.1.3 and 6.x through 6.2.0 allows XSS via the queue name of the live-poll feature when Internet Explorer is used.

Timeline

dates in UTC
  1. 2021-04-0606:15CVE publishedNVD

Versions per branch

OSV · NVD
sidekiq
BranchAffectedFixed in
6.x≥ 6.0.0, < 6.2.16.2.1
5.2< 5.2.05.2.0
Contribsys sidekiq
BranchAffectedFixed in
5.1≤ 5.1.3no fix published
6.x≥ 6.0.0, ≤ 6.2.0no fix published
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published

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.

Packages

  • candlepinRed Hat:satellite:6.11::el8all versions · fixed in 0:4.1.13-1.el8sat
  • candlepinRed Hat:satellite:6.11::el7all versions · fixed in 0:4.1.13-1.el7sat
  • foremanRed Hat:satellite:6.11::el8all versions · fixed in 0:3.1.1.21-2.el8sat
  • foremanRed Hat:satellite:6.11::el7all versions · fixed in 0:3.1.1.21-2.el7sat
  • foremanRed Hat:satellite_utils:6.11::el8all versions · fixed in 0:3.1.1.21-2.el8sat
  • foremanRed Hat:satellite_utils:6.11::el7all versions · fixed in 0:3.1.1.21-2.el7sat
  • foremanRed Hat:satellite_capsule:6.11::el8all versions · fixed in 0:3.1.1.21-2.el8sat
  • foremanRed Hat:satellite_capsule:6.11::el7all versions · fixed in 0:3.1.1.21-2.el7sat

33 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-30151 Red Hat Product Security2 products fixed

    sidekiq: XSS via the queue name of the live-poll feature

  • RHSA-2022:5498 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Satellite 6.11 Release

Full record on NVD

Fix

  1. Update sidekiq to 6.2.1 · 5.2.0
  2. Vendor fix Red Hat Product Security RHSA-2022:5498 · 2 productsFor Red Hat Satellite 6.11 see the following documentation for the release. https://access.redhat.com/documentation/en-us/red_hat_satellite/6.11 The important instructions on how to upgrade are available below. https://access.redhat.com/documentation/en-us/red_hat_satellite/6.11/html/upgrading_and…

Advisories and patches

Detection

read 2026-11-09 09:28 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

  • EUVD-2021-2205same flawENISA EUVD · LicenseRef-ENISA-legal-notice
  • GHSA-grh7-935j-hg6wsame flawGitHub Advisory Database · CC-BY-4.0
  • DLA-2943-1advisory covering several CVEsDebian · LicenseRef-unstated
  • DLA-3360-1advisory covering several CVEsDebian · LicenseRef-unstated
  • DLA-4407-1advisory covering several CVEsDebian · LicenseRef-unstated
  • RHSA-2022:5498advisory covering several CVEsRed Hat · CC-BY-4.0
  • RLSA-2022:5498advisory covering several CVEsRocky Linux · BSD-3-Clause
  • USN-7695-1advisory covering several CVEsUbuntu

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published
2021-04-06
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-grh7-935j-hg6w

Frequently asked questions

What is CVE-2021-30151?

Sidekiq through 5.1.3 and 6.x through 6.2.0 allows XSS via the queue name of the live-poll feature when Internet Explorer is used.

Is CVE-2021-30151 actively exploited?

Active exploitation of CVE-2021-30151 has not been confirmed. Its EPSS score was 4.2% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-30151?

CVE-2021-30151 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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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 ».

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