CVE-2021-3572 — Improper Input Validation in pip

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

• Documented patch — bugzilla.redhat.com (NIST National Vulnerability Database)
• Documented patch — www.oracle.com (NIST National Vulnerability Database)
• Documented patch — www.oracle.com (NIST National Vulnerability Database)
• Pip Pip: fixed in version 21.1 — github.com (GitHub Security Advisories)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Oracle Agile Product Lifecycle Management, Oracle Communications Cloud Native Core Network Function Cloud Native Environment, Oracle Communications Cloud Native Core Policy…).
2. Apply the fixed version or the patch documented under Remediation.
3. Exploitation requires user interaction: tighten email/web filtering and warn affected users.
4. Search available logs for exploit probes matching the vulnerability class (input validation), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-20 · Improper Input Validation

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 1.83%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

Timeline

What happened to this CVE, newest first.

• 2026
• Fix documented
  Oct 13, 2026 · GitHub Security Advisories
• Affected products added · pip/pip
  Oct 13, 2026 · GitHub Security Advisories
• SSVC assessment updated
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 13, 2026
• Fix documented
  Oct 13, 2026 · NIST National Vulnerability Database
• CVSS changed · 5.7
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · → Modified
  Oct 13, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 13, 2026 · NIST National Vulnerability Database
• 2021
• CVE published
  Nov 10, 2021 · redhat

Source activity

Repeated readings are counted rather than listed.

• 1× References added · Oct 13, 2026 – Oct 13, 2026
• 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

12 on the record

• bugzilla.redhat.com/show_bug.cgi
  Issue Tracking, Patch, Third Party Advisory, NIST National Vulnerability Database
• www.oracle.com/security-alerts/cpujul2022.html
  Patch, Third Party Advisory, NIST National Vulnerability Database
• www.oracle.com/security-alerts/cpuapr2022.html
  Patch, Third Party Advisory, NIST National Vulnerability Database
• nvd.nist.gov/vuln/detail/CVE-2021-3572
  GitHub Security Advisories
• github.com/pypa/pip/commit/e46bdda9711392fec0c45c1175bae6db847cb30b
  GitHub Security Advisories
• security.netapp.com/advisory/ntap-20240621-0006
  GitHub Security Advisories
• github.com/pypa/advisory-database/tree/main/vulns/pip/PYSEC-2021-437.yaml
  GitHub Security Advisories
• access.redhat.com/errata/RHSA-2021:3254
  GitHub Security Advisories
• security.netapp.com/advisory/ntap-20240621-0006/
  NIST National Vulnerability Database
• github.com/pypa/pip/pull/9827
  GitHub Security Advisories
• packetstormsecurity.com/files/162712/USN-4961-1.txt
  GitHub Security Advisories
• github.com/advisories/GHSA-5xp3-jfq3-5q8x
  GitHub Security Advisories

Elsewhere on this site

Related CVEs (same products)

• Critical CVE-2026-46859 Improper Authentication in Oracle Agile Product Lifecycle Management Jun 17, 2026
• Medium CVE-2026-8643 pip can extract console_scripts and gui_scripts outside installation directory Jun 1, 2026
• High CVE-2024-21287 Oracle Agile Product Lifecycle Management (PLM) Incorrect Authorization Vulnerability KEV Nov 18, 2024
• High CVE-2024-20953 Oracle Agile Product Lifecycle Management (PLM) Deserialization Vulnerability KEV Feb 16, 2024
• High CVE-2022-25762 Response mix-up with WebSocket concurrent send and close May 13, 2022
• Critical CVE-2022-22965 Spring Framework JDK 9+ Remote Code Execution Vulnerability KEV Apr 1, 2022

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2021-3572 is "Improper Input Validation in pip", rated Medium. It affects Agile Product Lifecycle Management (Oracle); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.7 describes technical severity. EPSS 1.83% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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