CVE-2021-36396

highpriority · track · 40EPSS 0.014 · 73 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

1.43% (73rd) EPSS

CVSS 7.5 · high

Is it mine?

12 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

In Moodle, insufficient redirect handling made it possible to blindly bypass cURL blocked hosts/allowed ports restrictions, resulting in a blind SSRF risk.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.8–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.15.8mediumAV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondaryexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · OSV

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-918USprimaryCWE-918USCWE-918US

exploits (1)

Public proof-of-concept and weaponised exploit code.

T0X1Cx/CVE-2021-36396-Moodle-Time-Based-SQLi-ExploitThis script demonstrates a time-based blind SQL injection on Moodle platforms, exploiting response delays to extract data.PoC · poc_in_github

affected products (12)

Products and version ranges known to be affected.

n/a Moodle≤ 3.11, 3.10 to 3.10.4, 3.9 to 3.9.7 and earlier unsupported versionsenisa_euvdEU
Мартин Догиамас Moodle3.9.0 → 3.11.0fstec_bduRU
ООО «Ред Софт» РЕД ОС≤ 7.2 Муромfstec_bduRU
moodle moodle< 3.9.8nvdUScpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle3.10.0 → 3.10.5nvdUScpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle3.11.0 → 3.11.1nvdUScpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
Bitnami moodle< 3.9.8osvUSpkg:bitnami/moodle
Bitnami moodle3.10.0 → 3.10.5osvUSpkg:bitnami/moodle
Bitnami moodle3.11.0 → 3.11.1osvUSpkg:bitnami/moodle
Packagist moodle/moodle< 3.9.8osvUSpkg:composer/moodle/moodle
Packagist moodle/moodle3.10.0-beta → 3.10.5osvUSpkg:composer/moodle/moodle
Packagist moodle/moodle3.11.0-beta → 3.11.1osvUSpkg:composer/moodle/moodle

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-0579Moodle: Mehrere SchwachstellenDeutsch2023-03-06csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Moodle ausnutzen, um beliebigen Programmcode auszuführen, Informationen offenzulegen, Dateien zu manipulieren, Sicherheitsvorkehrungen zu umgehen oder einen Cross-Site-Scripting-Angriff durchzuführen.
GHSA-4rmj-w58m-fvchMoodle vulnerable to Server-Side Request Forgery2023-03-06ghsa · osvUS
In Moodle, insufficient redirect handling made it possible to blindly bypass cURL blocked hosts/allowed ports restrictions, resulting in a blind SSRF risk.
BIT-moodle-2021-363962024-03-06vendor · osvUS
In Moodle, insufficient redirect handling made it possible to blindly bypass cURL blocked hosts/allowed ports restrictions, resulting in a blind SSRF risk.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv nvd cert_bund NVD CVE.org MITRE

published 2023-03-06modified 2026-06-17

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+4178 more

references (6)

External citations — patches, advisories, analysis.

scry

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