How severe is CVE-2021-43350?

CVE-2021-43350 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-43350?

CVE-2021-43350 affects the following packages: github.com/apache/trafficcontrol (Go), github.com/apache/trafficcontrol (Go). Ecosystems affected: Go.

How do I fix CVE-2021-43350?

Update github.com/apache/trafficcontrol to 6.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-43350 is resolved across your whole dependency graph.

How do I detect CVE-2021-43350 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/apache/trafficcontrol, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-43350 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2021-43350 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-43350 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-43350?

CVE-2021-43350 has an EPSS (Exploit Prediction Scoring System) score of 4.8%, placing it in the 92th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-43350?

CVE-2021-43350 is classified as CWE-90 (CWE-90), CWE-74 (CWE-74). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2021-43350 published, and has it been updated?

CVE-2021-43350 was published on November 11, 2021 and was last updated on October 24, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹

🐹 Go

Not in CISA KEV

CRITICAL severity

CVE-2021-43350 — trafficcontrol

CRITICAL

CVE-2021-43350 is a critical-severity (CVSS 9.8) CWE-90 vulnerability in github.com/apache/trafficcontrol. A fix is available for github.com/apache/trafficcontrol — see the affected versions and patch details below.

Apache Traffic Control Traffic Ops Vulnerable to LDAP Injection

Also known asGHSA-mg2c-rc36-p594GO-2024-2776

Published

Nov 11, 2021

Updated

Oct 24, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

4.8%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs92th percentile — riskier than 92% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected

🐹github.com/apache/trafficcontrol🐹github.com/apache/trafficcontrol

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/apache/trafficcontrol`	≥ 6.0.0&&< 6.0.1	6.0.1`go get github.com/apache/trafficcontrol@v6.0.1`
🐹Go	`github.com/apache/trafficcontrol`	≥ 5.1.0&&< 5.1.4	5.1.4`go get github.com/apache/trafficcontrol@v5.1.4`

Affected Products

1 product · 4 configurations

Application

traffic controlapache

≥ 6.0.0 && < 6.0.1

2 versions

5.1.46.0.1

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/apache/trafficcontrol, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/apache/trafficcontrol to 6.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-43350 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-43350 in your dependencies?

Find it across Go, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

9.8/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Raw vector

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

CWE Classification

CWE-90CWE-90 CWE-74CWE-74

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

trafficcontrol

5.4/10

Maintained0/10

Code-Review9/10

Branch-ProtectionN/A

Assessed Nov 2, 2026

Timeline

Disclosed

Nov 11, 2021

Last updated

Oct 24, 2026

Identifiers

CVE-2021-43350

GHSA-mg2c-rc36-p594

GO-2024-2776

References

Advisoryopenwall.com Advisoryopenwall.com Advisoryopenwall.com Advisorytrafficcontrol.apache.org · security Advisorynvd.nist.gov · CVE 2021 43350 Webpkg.go.dev · GO 2024 2776 Webtrafficcontrol.apache.org · security Packagegithub.com · trafficcontrol

Related vulnerabilities

Also affects trafficcontrol

This CVE is critical severity; 1 of 5 other CVEs affecting trafficcontrol is rated as high or higher (top: critical).

CVE-2017-7670CVE-2022-23206CVE-2021-42009CVE-2020-17522CVE-2019-12405

Same weakness: CWE-90

This CVE is critical severity — higher than any of the other 3 CVEs with CWE-90 (highest there: high).

CVE-2026-11748CVE-2026-53658CVE-2026-47303Browse all CWE-90

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026

CVE-2021-43350 — trafficcontrol

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2021-43350 in your dependencies?