Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N R C H N N 7.4 .0271 85.7 —
AFFECTED Product Versions Fixed n/a n/a – —
TIMELINE Mar 19 Reserved by mitre Aug 23 Published (CNA: mitre) Oct 14 RESCORED — CVE-2021-28861. CVSS 6.5 → 7.4 (NVD).
Python 3.x through 3.10 has an open redirection vulnerability in lib/http/server.py due to no protection against multiple (/) at the beginning of URI path which may leads to information disclosure. NOTE: this is disputed by a third party because the http.server.html documentation page states "Warning: http.server is not recommended for production. It only implements basic security checks."
| Date | Event | Detail |
|---|---|---|
| March 19, 2021 | Reserved | Reserved by mitre |
| August 23, 2022 | Published | Published (CNA: mitre) |
| October 14, 2026 | RESCORED | RESCORED — CVE-2021-28861. CVSS 6.5 → 7.4 (NVD). |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| n/a | n/a | — | n/a | — |
Authoritative record: CVE-2021-28861 at cve.org
Weaknesses: CWE-601
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-28861 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
