CVE-2021-24221

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 1.9% (78th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.9%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The Quiz And Survey Master – Best Quiz, Exam and Survey Plugin for WordPress plugin before 7.1.12 did not sanitise the result_id GET parameter on pages with the [qsm_result] shortcode without id attribute, concatenating it in a SQL statement and leading to an SQL injection. The lowest role allowed to use this shortcode in post or pages being author, such user could gain unauthorised access to the DBMS. If the shortcode (without the id attribute) is embed on a public page or post, then unauthenticated users could exploit the injection.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
45
EG Risk 45/100CISA SSVC

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
Severity88% × 45%
Exploitation2% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.9%
EPSS %ILE
78th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

April 12, 2021

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Aug 4, 2026
🔬 Proof of concept available. Patch available.
generic🟡 PoC Available

Quiz And Survey Master < 7.1.12 – Authenticated SQL injection via shortcode | CVE 2021-24221 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/3b52b25c-82a1-41c7-83ac-92e244f7c5ab

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 31× 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.

Showing the most recent 100 of 169 total refreshes for this CVE.

  1. 2026-10-05 17:40 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
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  7. 2026-09-30 15:31 UTCEG score recompute
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  1. 2026-09-11 09:33 UTCEPSS rescore
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  28. 2026-08-13 21:57 UTCEPSS rescore
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  46. 2026-07-23 14:15 UTCEPSS rescore
  47. 2026-07-23 01:58 UTCEG score recompute
  48. 2026-07-22 22:44 UTCEG score recompute
  49. 2026-07-22 14:05 UTCEPSS rescore
  50. 2026-07-21 15:22 UTCEPSS rescore
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  52. 2026-07-20 17:04 UTCEPSS rescore
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  67. 2026-07-09 19:07 UTCEPSS rescore
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  73. 2026-07-05 02:28 UTCEPSS rescore
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  75. 2026-07-04 06:29 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2021-24221?
CVE-2021-24221 is a high vulnerability published on April 12, 2021. The Quiz And Survey Master – Best Quiz, Exam and Survey Plugin for WordPress plugin before 7.1.12 did not sanitise the resultid GET parameter on pages with the [qsmresult] shortcode without id attribute, concatenating it in a SQL statement and leading to an SQL injection. The lowest role allowed to…
When was CVE-2021-24221 disclosed?
CVE-2021-24221 was first published on April 12, 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-2021-24221 actively exploited?
CVE-2021-24221 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.9% probability of exploitation in the next 30 days (78th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-24221?
CVE-2021-24221 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-24221?
A fix for CVE-2021-24221 is available: update to the fixed version the vendor names in its advisory.

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