CVE-2021-43350Network attack vector

LDAP query manipulation via unsanitized login username

Published Nov 11, 2021 · Updated Aug 4, 2024

LDAP injection in Apache Traffic Control Traffic Ops 5.1.0 through 5.1.3 and 6.0.0 allows remote attackers to alter LDAP queries via POST /login. The login handler inserts a specially crafted username into an LDAP filter without neutralizing LDAP metacharacters, changing the directory query executed during authentication. The endpoint is unauthenticated and exists in every API version, but Apache has not published the exact post-injection consequence and reachability depends on LDAP-backed authentication.

CVSS severity9.8
Critical
EPSS probability4.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

LDAP injection in Apache Traffic Control Traffic Ops 5.1.0 through 5.1.3 and 6.0.0 allows remote attackers to alter LDAP queries via POST /login. The login handler inserts a specially crafted username into an LDAP filter without neutralizing LDAP metacharacters, changing the directory query executed during authentication. The endpoint is unauthenticated and exists in every API version, but Apache has not published the exact post-injection consequence and reachability depends on LDAP-backed authentication.

The record

CVE
CVE-2021-43350
Published
Nov 11, 2021
Updated
Aug 4, 2024
Vendor
The Apache Software Foundation
Product
Apache Traffic Control
Classifications
CWE-90, CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=Traffic Ops <6.0.1 changes=[{"at":"5.1.4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Traffic Controlversion=Traffic Ops <6.0.1 changes=[{"at":"5.1.4","status":"unaffected"}]

Published CVSS scores

9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/A:P

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.

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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-90Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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