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Public proof of conceptFix available

CVE-2021-3572

A public proof of concept exists; no exploitation attested.

  • Published2021-11-10
  • WeaknessCWE-20

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

A flaw was found in python-pip in the way it handled Unicode separators in git references. A remote attacker could possibly use this issue to install a different revision on a repository. The highest threat from this vulnerability is to data integrity. This is fixed in python-pip version 21.1.

Timeline

dates in UTC
  1. 2021-11-1018:15CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Versions per branch

NVD
Oracle communications cloud native core network function cloud native environment
BranchAffectedFixed in
1.10= 1.10.0no fix published
22.1= 22.1.0no fix published
Oracle communications cloud native core policy
BranchAffectedFixed in
1.15= 1.15.0no fix published
22.1= 22.1.3no fix published
Oracle agile product lifecycle management
BranchAffectedFixed in
9.3= 9.3.6no fix published

1 more product in the sources.

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

Products declared by the CNA1 product

As redhat, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • python-pip
    Affected
    • = fixed in python-pip 21.1no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2024-06-21

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

  • babelRocky Linux:8all versions · fixed in 0:2.7.0-11.module+el8.5.0+672+ab6eb015
  • babelRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:2.7.0-11.module+el8.5.0+11015+9c1c7c42and 1 other package
  • CythonRocky Linux:8all versions · fixed in 0:0.29.14-4.module+el8.4.0+570+c2eaf144
  • CythonRocky Linux:8all versions · fixed in 0:0.29.21-5.module+el8.4.0+574+843c4898
  • CythonRed Hat:enterprise_linux:8::crball versions · fixed in 0:0.29.21-5.module+el8.4.0+9822+20bf1249and 3 other packages
  • CythonRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:0.29.14-4.module+el8.4.0+8888+89bc7e79and 3 other packages
  • mod_wsgiRocky Linux:8all versions · fixed in 0:4.6.8-3.module+el8.4.0+570+c2eaf144
  • mod_wsgiRocky Linux:8all versions · fixed in 0:4.7.1-4.module+el8.4.0+574+843c4898

302 more package ranges on OSV.dev

Vendor advisories

  • RHSA-2021:4160 Red Hat Product Security229 products fixed

    Red Hat Security Advisory: python39:3.9 and python39-devel:3.9 security update

  • RHSA-2021:4162 Red Hat Product Security239 products fixed

    Red Hat Security Advisory: python38:3.8 and python38-devel:3.8 security update

  • RHSA-2021:3254 Red Hat Product Security126 products fixed

    Red Hat Security Advisory: rh-python38 security, bug fix, and enhancement update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2021:4160 · 229 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
Published
2021-11-10
Last Modified
2026-10-08
NVD status
Modified
GitHub Advisory
GHSA-5xp3-jfq3-5q8x

Frequently asked questions

What is CVE-2021-3572?

A flaw was found in python-pip in the way it handled Unicode separators in git references. A remote attacker could possibly use this issue to install a different revision on a repository. The highest threat from this vulnerability is to data integrity. This is fixed in python-pip version 21.1.

Is CVE-2021-3572 actively exploited?

Active exploitation of CVE-2021-3572 has not been confirmed. Its EPSS score was 1.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3572?

CVE-2021-3572 has a CVSS v3 base score of 5.7 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N.

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