CVE-2021-27200

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0

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

In WoWonder 3.0.4, remote attackers can take over any account due to the weak cryptographic algorithm in recover.php. The code parameter is easily predicted from the time of day.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
87.4%
KEV
Not listed

Published

June 11, 2021

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jul 1, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

WoWonder - The Ultimate PHP Social Network Platform

https://www.wowonder.com
generic🟡 PoC Available

WoWonder Social Network Platform 3.1 - Authentication Bypass - PHP webapps Exploit

https://www.exploit-db.com/exploits/49989

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 49× 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. 2026-07-23 01:59 UTCEG score recompute
  2. 2026-07-22 22:45 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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  70. 2026-05-26 14:57 UTCEG score recompute
  71. 2026-05-26 14:57 UTCGHSA enrichment
  72. 2026-05-26 07:17 UTCEPSS rescore
  73. 2026-05-26 07:17 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2021-27200?
CVE-2021-27200 is a critical vulnerability published on June 11, 2021. In WoWonder 3.0.4, remote attackers can take over any account due to the weak cryptographic algorithm in recover.php. The code parameter is easily predicted from the time of day.
When was CVE-2021-27200 disclosed?
CVE-2021-27200 was first published in the National Vulnerability Database on June 11, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-27200 actively exploited?
CVE-2021-27200 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-27200?
CVE-2021-27200 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-27200?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-27200, 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.

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