CVE-2021-3956

4.3 MEDIUM 0.8% exploit odds Fix listed

What it is

A read-only authentication bypass vulnerability was reported in the Third Quarter 2021 release of Lenovo XClarity Controller (XCC) firmware affecting XCC devices configured in LDAP Authentication Only Mode and using an LDAP server that supports “unauthenticated bind”, such as Microsoft Active Directory. An unauthenticated user can gain read-only access to XCC in such a configuration, thereby allowing the XCC device configuration to be viewed but not changed. XCC devices configured to use local authentication, LDAP Authentication + Authorization Mode, or LDAP servers that support only “authenticated bind” and/or “anonymous bind” are not affected.

At a glance

Exploitability: Can be exploited from the same network segment without logging in. Limited direct impact.
Exploit odds: 0.8% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2022-05-18 16:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 04:06 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.8% in the next 30 days (EPSS).
Severity: 4.3 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2022-05-18 16:15 UTC
Last modified: 2026-06-17 04:06 UTC
Exploit probability: 0.8% · EPSS, next 30 days
Weakness: CWE-863 · Incorrect authorization
Record status: Modified

Affected

Lenovo Xclarity Controller < 7.22_cdi382o
Lenovo Xclarity Controller < 2.32_psi342n
Lenovo Xclarity Controller < 3.41_tei382m
Lenovo Xclarity Controller < 4.83_tei3c0n
Lenovo Xclarity Controller < 1.51_tgbt24l

Attack profile CVSS 3.1 · 4.3

Attack vector: Adjacent network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

Raw vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record