CVE-2021-43350 | LDAP filter injection vulnerability in Traffic Ops

An unauthenticated Apache Traffic Control Traffic Ops user can send a request with a specially-crafted username to the POST /login endpoint of any API version to inject unsanitized content into the LDAP filter.

Published: 2021-11-11 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-43350 is rated High Risk (74.2/100): CVSS Critical severity, with high exploitation likelihood (EPSS 4.43%, 90th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +3.50% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-43350

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.94% 4.43% +3.50%
2 2026-05-12 1.25% 0.94% -0.32%
3 2026-04-25 — 1.25% —

Full EPSS history (29 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-43350

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2021-43350

GitHub Security Advisory for CVE-2021-43350

GHSA-mg2c-rc36-p594 · Severity: critical · Ecosystem: go — Apache Traffic Control Traffic Ops Vulnerable to LDAP Injection

Affected software / configurations for CVE-2021-43350

Vendor Product Version Raw CPE
apache traffic_control >= 5.1.0, < 5.1.4 cpe:2.3:a:apache:traffic_control:*:*:*:*:*:*:*:*
apache traffic_control >= 6.0.0, < 6.0.1 cpe:2.3:a:apache:traffic_control:*:*:*:*:*:*:*:*
apache traffic_control 5.1.4 cpe:2.3:a:apache:traffic_control:5.1.4:rc0:*:*:*:*:*:*
apache traffic_control 6.0.1 cpe:2.3:a:apache:traffic_control:6.0.1:rc0:*:*:*:*:*:*

References for CVE-2021-43350

cvelogic Threat Intelligence