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Actively exploited

CVE-2015-3035 TP-Link Multiple Archer Devices Directory Traversal Vulnerability

Directory traversal vulnerability in multiple TP-Link Archer devices allows remote attackers to read arbitrary files via a .. (dot dot) in the PATH_INFO to login/.

From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.

Our Assessment

Should You Worry?

Patch urgentlyCybergen assessment
  • CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 25 Mar 2022.
  • Rated High severity (CVSS 7.5, scored by CISA).
  • It has been in the catalogue for 1,687 days. Systems still unpatched now have almost certainly been scanned for it.
The Vulnerability

What It Is

Directory traversal vulnerability in TP-LINK Archer C5 (1.2) with firmware before 150317, C7 (2.0) with firmware before 150304, and C8 (1.0) with firmware before 150316, Archer C9 (1.0), TL-WDR3500 (1.0), TL-WDR3600 (1.0), and TL-WDR4300 (1.0) with firmware before 150302, TL-WR740N (5.0) and TL-WR741ND (5.0) with firmware before 150312, and TL-WR841N (9.0), TL-WR841N (10.0), TL-WR841ND (9.0), and TL-WR841ND (10.0) with firmware before 150310 allows remote attackers to read arbitrary files via a .. (dot dot) in the PATH_INFO to login/.

From Watch to Action

What To Do Now

  1. 1

    Find it

    Search your asset inventory and external attack surface for TP-Link Multiple Archer Devices. Include cloud images, appliances and anything a supplier runs for you.

    Attack Surface Management
  2. 2

    Fix it

    Apply updates per vendor instructions.

    Vulnerability Management
  3. 3

    Hunt for compromise

    If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.

    Incident Response
  4. 4

    Prove it is fixed

    Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.

    Penetration Testing

Vendor Advisories

Regulation

The Compliance Clock

Cyber EssentialsRated high, so if it affects devices in your Cyber Essentials scope, the update must be installed within 14 days of the vendor releasing it.NIS2If exploitation causes a significant incident, essential and important entities owe their CSIRT an early warning within 24 hours and a notification within 72 hours.DORAFinancial entities must classify ICT incidents and send an initial notification for a major incident within strict deadlines, with exploited flaws a common cause.US federal (BOD 22-01)Federal civilian agencies had until 15 Apr 2022 to remediate. A sensible benchmark for everyone else.

General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.

Stay Ahead

More Exploited TP-Link Flaws

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CVE-2023-50224TP-Link TL-WR841N Authentication Bypass by Spoofing VulnerabilityAdded 3 Sep 2025CVE-2025-9377TP-Link Archer C7(EU) and TL-WR841N/ND(MS) OS Command Injection VulnerabilityAdded 3 Sep 2025CVE-2020-24363TP-link TL-WA855RE Missing Authentication for Critical Function VulnerabilityAdded 2 Sep 2025CVE-2023-33538TP-Link Multiple Routers Command Injection VulnerabilityAdded 16 Jun 2025CVE-2023-1389TP-Link Archer AX-21 Command Injection VulnerabilityAdded 1 May 2023

All 6 exploited TP-Link vulnerabilities

Not Sure If You Are Exposed?

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Evidence

Sources

  1. CISA Known Exploited Vulnerabilities catalogue
  2. NVD: CVE-2015-3035
  3. CVE record: CVE-2015-3035
  4. FIRST EPSS
  5. tp-link.com/en/download/Archer-C9_V1.html#Firmware
  6. tp-link.com/en/download/Archer-C7_V2.html#Firmware
  7. tp-link.com/en/download/TL-WR740N_V5.html#Firmware
  8. tp-link.com/en/download/Archer-C5_V1.20.html#Firmware
  9. packetstormsecurity.com/files/131378/TP-LINK-Local-File-Disclosure.html
  10. tp-link.com/en/download/TL-WR841N_V9.html#Firmware
  11. tp-link.com/en/download/TL-WR841ND_V9.html#Firmware
  12. seclists.org/fulldisclosure/2015/Apr/26