Critical
lemonldap-ng — security advisory
An issue was discovered in LemonLDAP::NG (aka lemonldap-ng) 2.0.13. When using the RESTServer plug-in to operate a REST password validation service (for another LemonLDAP::NG instance, for example) and using the Kerberos authentication method combined with another method with the Combination authentication plug-in, any password will be recognized as valid for an existing user.
- Products
- lemonldap-ng
- Affected versions
- 1.3.3-1, 1.4.6-1, 1.4.6-2, 1.4.6-3, 1.9.10-1, 1.9.13-2, 1.9.14-1, 1.9.15-1, 1.9.16-2, 2.0.11+ds-4, 2.0.13+ds-3, 2.0.13+ds-3ubuntu1, 2.0.5+ds-2, 2.0.6+ds-2, 2.0.7+ds-2, 2.16.2+ds-1, 2.17.1+ds-1, 2.17.2+ds-1, 2.17.2+ds-2, 2.18.1+ds-1, 2.18.2+ds-1, 2.20.2+ds-1build1, 2.21.0+ds-3, 2.22.0+ds-2, 2.22.1+ds-1, 2.22.2+ds-1, 2.22.3+ds-1, 2.23.0+ds-3, 2.23.0+ds-4, 2.23.2+ds-1, 2.23.2+ds-2, 2.23.3+ds-1
- Fixed versions
- Not specified
- CVEs
- CVE-2021-40874
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:00 UTC · Revision 1
Source evidence
An issue was discovered in LemonLDAP::NG (aka lemonldap-ng) 2.0.13. When using the RESTServer plug-in to operate a REST password validation service (for another LemonLDAP::NG instance, for example) and using the Kerberos authentication method combined with another method with the Combination authentication plug-in, any password will be recognized as valid for an existing user.
osv:UBUNTU-CVE-2021-40874
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
Complete source record
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"id": "8682b60f9f597c91f7b239d2f7bccc323b3443b4263c800f009b0709d96cd5c6",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-40874",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2021-40874",
"summary": "An issue was discovered in LemonLDAP::NG (aka lemonldap-ng) 2.0.13. When using the RESTServer plug-in to operate a REST password validation service (for another LemonLDAP::NG instance, for example) and using the Kerberos authentication method combined with another method with the Combination authentication plug-in, any password will be recognized as valid for an existing user.",
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"evidence": "/affected/6/versions"
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"evidence": "/affected/6/versions"
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"evidence": "/affected/6/versions"
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{
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"aliases": [
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},
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"binary_version": "2.22.2+ds-1"
},
{
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"binary_version": "2.22.2+ds-1"
},
{
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"binary_version": "2.22.2+ds-1"
},
{
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"binary_version": "2.22.2+ds-1"
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"binary_version": "2.22.2+ds-1"
},
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}
]
}
}
],
"modified": "2026-10-17T12:56:20.781283944Z",
"provider": "osv",
"upstream": [
"CVE-2021-40874"
],
"references": [
"https://ubuntu.com/security/CVE-2021-40874",
"https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/issues/2612",
"https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/commit/66946e8f754812b375768c2124937137c856fe0c",
"https://www.cve.org/CVERecord?id=CVE-2021-40874"
]
},
"related_cves": [
{
"value": "CVE-2021-40874",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 355355,
"published_at": "2022-07-18T00:15:00+00:00"
}