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onyx --cves cve-2020-5421

CVE-2020-5421

MEDPOCADV 1Spring Framework
score
4.4
cvss
6.5
epss
11.6%
published
2020-09-19
kev added
—
first seen

Spring Framework versions 5.2.0 - 5.2.8, 5.1.0 - 5.1.17, 5.0.0 - 5.0.18, 4.3.0 - 4.3.28, and older unsupported versions contain a session fixation vulnerability caused by bypassing protections against RFD attacks from CVE-2015-5211 through the use of a jsessionid path parameter, letting attackers hijack sessions, exploit requires attacker to manipulate session identifiers.

Timeline

How this CVE moved toward exploitation. Chart: last 30 days — trend score, EPSS, community mentions per day; hover the event lane.

events2020-09-19 — PublishedP2026-10-16 — First advisory — CERT-FR (avis): Multiples vulnérabilités dans les produits IBM (16 octobre 2026)A2026-10-21 — Tracked by OnyxT2026-10-21 — Public PoCXscore2026-10-21: score 4.44.4epss2026-09-22: epss 10.7%2026-09-23: epss 10.7%2026-09-24: epss 10.7%2026-09-25: epss 10.7%2026-09-26: epss 10.7%2026-09-27: epss 10.7%2026-09-28: epss 10.7%2026-09-29: epss 10.7%2026-09-30: epss 10.7%2026-10-01: epss 10.7%2026-10-02: epss 10.7%2026-10-03: epss 10.7%2026-10-04: epss 10.7%2026-10-05: epss 10.7%2026-10-06: epss 10.7%2026-10-07: epss 10.7%2026-10-08: epss 10.7%2026-10-09: epss 10.7%2026-10-10: epss 10.7%2026-10-11: epss 10.7%2026-10-12: epss 10.4%2026-10-13: epss 11.4%2026-10-14: epss 11.6%2026-10-15: epss 11.6%2026-10-16: epss 11.6%2026-10-18: epss 11.6%2026-10-19: epss 11.6%2026-10-20: epss 11.6%2026-10-21: epss 11.6%11.6%mentions/day0no mentions in 30 days2026-09-22today
  1. Published
  2. First advisory — CERT-FR (avis) Multiples vulnérabilités dans les produits IBM (16 octobre 2026)
  3. Tracked by Onyx
  4. Public PoC

Advisories

1 feed this week

Exploit availability

Public PoC flagged by vulnx; no direct exploit link among the citations.

Weaknesses

NVD-CWE-noinfo

References 23