CVE-2020-9374Tl-Wr849n Firmware OS Command Injection
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.
Published Feb 24, 2020 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2020-9374 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Tl-Wr849n Firmware (Tp-Link).
- It is exploited in the wild, listed in Industry KEV feed since Mar 23, 2026. Public exploit code is available.
- EPSS estimates a 43% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
43%
Higher than 98.7% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
47/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Mar 23, 2026
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
3
Proof-of-concept links
In-the-wild evidence
2
Reports of active use
Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Mar 23, 2026 | n/a | Not reported |
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Tl-Wr849n FirmwareTp-Link | 0.9.1_4.16 | n/a |
Timeline
Publicly disclosed
Feb 24, 2020
Last updated
Nov 21, 2024
Added to Industry KEV feed
Mar 23, 2026
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
FAQ
Common Questions.
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.
Affected: Tl-Wr849n Firmware (Tp-Link) versions 0.9.1_4.16. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Mar 23, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2020-9374 On Your Attack Surface?
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