How severe is CVE-2021-43350?

CVE-2021-43350 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-43350 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43350?

CVE-2021-43350 primarily affects Apache Traffic Control. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-43350?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-43350 published?

CVE-2021-43350 was published on 2021-11-11 and last updated on 2026-06-17.

CVE-2021-43350

CVE-2021-43350 is a critical-severity vulnerability in Apache Traffic Control with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 5% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Apache Traffic Control
Published: 2021-11-11
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-43350?: 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.
How severe is CVE-2021-43350?: CVE-2021-43350 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-43350 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43350?: CVE-2021-43350 primarily affects Apache Traffic Control. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-43350?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-43350 published?: CVE-2021-43350 was published on 2021-11-11 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:apache:traffic_control:*:*:*:*:*:*:*:*
cpe:2.3:a:apache:traffic_control:5.1.4:rc0:*:*:*:*:*:*
cpe:2.3:a:apache:traffic_control:6.0.1:rc0:*:*:*:*:*:*

More vulnerabilities in Apache Traffic Control

CVE-2024-45387 — Critical (CVSS 9.9): An SQL injection vulnerability in Traffic Ops in Apache Traffic Control <= 8.0.1, >= 8.0.0 allows a privileged user…
CVE-2019-12405 — Critical (CVSS 9.8): Improper authentication is possible in Apache Traffic Control versions 3.0.0 and 3.0.1 if LDAP is enabled for login in…
CVE-2025-61581 — High (CVSS 7.5): ** UNSUPPORTED WHEN ASSIGNED ** Inefficient Regular Expression Complexity vulnerability in Apache Traffic…
CVE-2022-23206 — High (CVSS 7.5): In Apache Traffic Control Traffic Ops prior to 6.1.0 or 5.1.6, an unprivileged user who can reach Traffic Ops over…
CVE-2017-7670 — High (CVSS 7.5): The Traffic Router component of the incubating Apache Traffic Control project is vulnerable to a Slowloris style Denial…
CVE-2020-17522 — Medium (CVSS 5.8): When ORT (now via atstccfg) generates ip_allow.config files in Apache Traffic Control 3.0.0 to 3.1.0 and 4.0.0 to…

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