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Vulnerabilities

Vulnerability · CVE-2020-9374

TP-Link tl-wr849n_firmware Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Published Mar 23, 2026 · catalog updated Mar 23, 2026 · TP-Link

Patch now

CVE-2020-9374 is in the CISA known-exploited catalog. Confirm TP-Link against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
42.67%
Remediation
Remediation guidance
Affected products
vendor TP-Link tl-wr849n_firmware

On TP-Link TL-WR849N 0.9.1 4.16 devices, a remote command execution vulnerability in the diagnostics area can be exploited when an attacker sends specific shell metacharacters to the panel's traceroute feature.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor TP-Link tl-wr849n_firmwareversion unspecified

How to fix CVE-2020-9374

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2020-9374 is in the CISA known-exploited catalog. Confirm TP-Link against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 42.67%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 23, 2026 · VulnCheck KEV

    Detected

    On TP-Link TL-WR849N 0.9.1 4.16 devices, a remote command execution vulnerability in the diagnostics area can be exploited when an attacker sends specific shell metacharacters to the panel's traceroute feature.

  2. Mar 23, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2020-9374

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-9374

    30-day exploitation probability 42.7%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2020-9374

    On TP-Link TL-WR849N 0.9.1 4.16 devices, a remote command execution vulnerability in the diagnostics area can be exploited when an attacker sends specific shell metacharacters to the panel's traceroute feature.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.