CVE-2021-36721Network attack vector

Unauthenticated LDAP username disclosure via API requests

Published Dec 14, 2021 · Updated Sep 16, 2024

Information disclosure in SysAid API before 21.3.60 allows remote attackers to retrieve LDAP usernames through unauthenticated requests. A specific API path returns names obtained from the connected LDAP server without first enforcing authorization. SysAid has not published the path or request structure, and the documented consequence is limited to disclosure of usernames.

CVSS severity4.4
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in SysAid API before 21.3.60 allows remote attackers to retrieve LDAP usernames through unauthenticated requests. A specific API path returns names obtained from the connected LDAP server without first enforcing authorization. SysAid has not published the path or request structure, and the documented consequence is limited to disclosure of usernames.

The record

CVE
CVE-2021-36721
Published
Dec 14, 2021
Updated
Sep 16, 2024
Vendor
SysAid
Product
SysAid API
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=Sysaid – version 20.4.74 20.4.74

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SysAid · SysAid APIversion=Sysaid – version 20.4.74 20.4.74

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
4.4Israel National Cyber DirectorateCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

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

T1190Exploit Public-Facing Application

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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