CVE-2025-53771

CRITICALNVD 6.59.0▲
EchelonGraph scoreMEDIUM confidence

Score elevated to 9.0 because EPSS predicts 100% probability of exploitation within the next 30 days (top 0.0% of all CVEs). NVD baseline CVSS 6.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Weaponized
9.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 100%
  • Public exploit code is available (Metasploit, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 100%CVSS: 6.5Exploit: Metasploit · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.

CVSS v3
6.5
EG Score
9.0(medium)
EG Risk
95(Track)
EG Risk 95/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
100%
EPSS %ILE
100%
KEV
Not listed

Published

July 20, 2025

Last Modified

August 14, 2025

References (2)

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 3× in last 7d / 8× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-30 01:30 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-24 14:17 UTCEPSS rescore
  4. 2026-07-23 02:58 UTCEG score recompute
  5. 2026-07-22 21:21 UTCEG score recompute▲ 2.70
  6. 2026-07-22 21:21 UTCVendor advisory
  7. 2026-07-22 21:21 UTCGHSA enrichment
  8. 2026-07-12 05:46 UTCEPSS rescore
  9. 2026-06-25 13:49 UTCEPSS rescore
  10. 2026-06-21 01:59 UTCEPSS rescore
  11. 2026-06-21 01:59 UTCEPSS rescore
  12. 2026-06-15 17:48 UTCEPSS rescore
  13. 2026-06-14 23:17 UTCEPSS rescore
  14. 2026-06-13 23:00 UTCEPSS rescore
  15. 2026-06-12 23:11 UTCEPSS rescore
  16. 2026-06-11 14:00 UTCEPSS rescore
  17. 2026-06-11 14:00 UTCEPSS rescore
  18. 2026-06-10 22:18 UTCEPSS rescore
  19. 2026-06-10 22:18 UTCEPSS rescore
  20. 2026-06-10 13:22 UTCEPSS rescore
  21. 2026-06-10 13:22 UTCEPSS rescore
  22. 2026-06-08 14:16 UTCEPSS rescore
  23. 2026-06-08 14:16 UTCEPSS rescore
  24. 2026-06-07 15:24 UTCEPSS rescore
  25. 2026-06-07 15:24 UTCEPSS rescore
Show 20 more
  1. 2026-06-06 13:47 UTCEPSS rescore
  2. 2026-06-06 13:47 UTCEPSS rescore
  3. 2026-06-05 22:46 UTCEPSS rescore
  4. 2026-06-05 22:46 UTCEPSS rescore
  5. 2026-06-05 06:10 UTCEPSS rescore
  6. 2026-06-05 06:10 UTCEPSS rescore
  7. 2026-06-04 13:12 UTCEPSS rescore
  8. 2026-06-04 13:12 UTCEPSS rescore
  9. 2026-06-02 20:12 UTCEPSS rescore
  10. 2026-06-02 20:12 UTCEPSS rescore
  11. 2026-06-01 13:51 UTCEPSS rescore
  12. 2026-06-01 13:51 UTCEPSS rescore
  13. 2026-05-31 22:30 UTCEPSS rescore
  14. 2026-05-31 22:30 UTCEPSS rescore
  15. 2026-05-31 00:16 UTCEPSS rescore
  16. 2026-05-31 00:16 UTCEPSS rescore
  17. 2026-05-30 01:43 UTCEG score recompute
  18. 2026-05-30 01:43 UTCVendor advisory
  19. 2026-05-30 01:43 UTCGHSA enrichment
  20. 2026-05-29 13:44 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/windows/http/sharepoint_toolpane_rce✓ verified
    First seen Jul 8, 2025

    Microsoft SharePoint Server ToolPane Unauthenticated Remote Code Execution (aka ToolShell)

    Open source ↗
  • Nucleihttp/cves/2025/CVE-2025-53771.yaml
    First seen Jan 1, 2025

    Microsoft SharePoint Server - Authentication Bypass (ToolShell)

    Open source ↗

Frequently asked(5)

What is CVE-2025-53771?
CVE-2025-53771 is a critical vulnerability published on July 20, 2025. Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
When was CVE-2025-53771 disclosed?
CVE-2025-53771 was first published in the National Vulnerability Database on July 20, 2025, with the most recent update on August 14, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-53771 actively exploited?
CVE-2025-53771 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 100% probability of exploitation in the next 30 days, which ranks it in the top 0.0% of all scored CVEs.
What is the CVSS score of CVE-2025-53771?
CVE-2025-53771 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
How do I remediate CVE-2025-53771?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-53771, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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