CVE-2022-30600Network attack vector

Password guessing via miscounted failed logins

Published May 18, 2022 · Updated Aug 3, 2024

Incorrect calculation in Moodle LMS allows remote attackers to bypass configured account lockout while repeatedly guessing passwords. The failed-login accounting logic miscounts authentication failures, although the public advisory does not disclose the responsible condition or function. Exposure requires account lockout to be enabled; the flaw permits continued password guessing but does not itself disclose credentials or authenticate a session.

CVSS severity9.8
Critical
EPSS probability5.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect calculation in Moodle LMS allows remote attackers to bypass configured account lockout while repeatedly guessing passwords. The failed-login accounting logic miscounts authentication failures, although the public advisory does not disclose the responsible condition or function. Exposure requires account lockout to be enabled; the flaw permits continued password guessing but does not itself disclose credentials or authenticate a session.

The record

CVE
CVE-2022-30600
Published
May 18, 2022
Updated
Aug 3, 2024
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-682, T1110.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Affects : 4.0, 3.11 to 3.11.6, 3.10 to 3.10.10, 3.9 to 3.9.13 and earlier unsupported versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moodle · Moodle LMSversion=Affects : 4.0, 3.11 to 3.11.6, 3.10 to 3.10.10, 3.9 to 3.9.13 and earlier unsupported versions

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-682Incorrect Calculation
T1110.001Password Guessing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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