How severe is CVE-2016-6601?

CVE-2016-6601 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which products are affected by CVE-2016-6601?

CVE-2016-6601 affects the following products: zohocorp webnms framework.

How do I patch CVE-2016-6601?

No patch has shipped for CVE-2016-6601 yet — track the zohocorp webnms framework advisory for a fixed release and apply the workarounds below in the meantime.

How do I detect CVE-2016-6601 across my infrastructure?

Inventory every zohocorp webnms framework deployment and check each version against the affected-products list above.

How do I mitigate CVE-2016-6601 if there is no patch (or I can't update yet)?

Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Is CVE-2016-6601 actively exploited in the wild?

Yes. There are 8 known exploit references for CVE-2016-6601, including 1 documented proof-of-concept exploit on Exploit-DB and 7 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2016-6601?

CVE-2016-6601 has an EPSS (Exploit Prediction Scoring System) score of 97.5%, placing it in the 100th 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. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2016-6601?

CVE-2016-6601 is classified as Path Traversal (CWE-22). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2016-6601?

CVE-2016-6601 affects zohocorp webnms framework (1 version, e.g. 5.2). Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2016-6601?

A Nuclei detection template exists for CVE-2016-6601, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2016-6601 published, and has it been updated?

CVE-2016-6601 was published on January 23, 2017 and was last updated on June 17, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🛡️

Not in CISA KEV

HIGH severity

CVE-2016-6601 — Webnms Framework

HIGH

CVE-2016-6601 is a high-severity (CVSS 7.5) Path Traversal vulnerability in zohocorp webnms framework. 8 public exploit references exist, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

Directory traversal vulnerability in the file download functionality in ZOHO WebNMS Framework 5.2 and 5.2 SP1 allows remote attackers to read arbitrary files via a .. (dot dot) in the…

Published

Jan 23, 2017

Updated

Jun 17, 2026

Affected

1 product

Patched

See advisory

Exploits

8 known

Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

97.5%probability of exploitation in next 30 days

Very High Risk+0.12%

Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk

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

How urgent is this, really

CVE-2016-6601 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the ≥ 90% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Directory traversal vulnerability in the file download functionality in ZOHO WebNMS Framework 5.2 and 5.2 SP1 allows remote attackers to read arbitrary files via a .. (dot dot) in the fileName parameter to servlets/FetchFile.

Affected Products

1 product · 2 configurations

Application

webnms frameworkzohocorp

1 version

5.2

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-40229webappsjsp

WebNMS Framework Server 5.2/5.2 SP1 - Multiple Vulnerabilities

by Pedro Ribeiro · Aug 10, 2016

Exploit-DB Source

Detection & mitigation playbook

Vendor / appliance

Detect
Inventory every zohocorp webnms framework deployment and check each version against the affected-products list above.
Remediation status
No patch has shipped for CVE-2016-6601 yet — track the zohocorp webnms framework advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

How to detect CVE-2016-6601

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2016-6601 -u https://target

Template: ZOHO WebNMS Framework <5.2 SP1 - Local File Inclusion
Severity: high
Impact: Successful exploitation of this vulnerability could lead to unauthorized access to sensitive information, remote code execution, or complete compromise of the affected system.
Remediation: Upgrade to ZOHO WebNMS Framework version 5.2 SP1 or later to mitigate this vulnerability.

Template by ProjectDiscovery nuclei-templates (0x_Akoko), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

O3 Security · Runtime Protection

Is CVE-2016-6601 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

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