How severe is CVE-2016-6277?

CVE-2016-6277 has a CVSS score of 8.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2016-6277?

Affected package information for CVE-2016-6277 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2016-6277?

No fixed version has been published for CVE-2016-6277 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2016-6277 actively exploited in the wild?

Yes. There are 10 known exploit references for CVE-2016-6277, including 2 documented proof-of-concept exploits 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-2016-6277?

CVE-2016-6277 has an EPSS (Exploit Prediction Scoring System) score of 94.3%, 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.

Is CVE-2016-6277 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2016-6277 (NETGEAR Multiple Routers Remote Code Execution Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-03-07. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-09-07. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2016-6277?

CVE-2016-6277 is classified as Cross-Site Request Forgery (CSRF) (CWE-352). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2016-6277?

CVE-2016-6277 affects netgear d6220 firmware; netgear d6400 firmware; netgear r6250 firmware; netgear r6400 firmware, and 7 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2016-6277?

A Nuclei detection template exists for CVE-2016-6277, 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-2016-6277 published, and has it been updated?

CVE-2016-6277 was published on December 14, 2016 and was last updated on April 21, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-03-07 — agencies required to remediate by 2022-09-07

CVE-2016-6277

HIGH

NETGEAR R6250 before 1.0.4.6.Beta, R6400 before 1.0.1.18.Beta, R6700 before 1.0.1.14.Beta, R6900, R7000 before 1.0.7.6.Beta, R7100LG before 1.0.0.28.Beta, R7300DST before 1.0.0.46.Beta,…

Published

Dec 14, 2016

Updated

Apr 21, 2026

Affected

0 pkgs

Patched

None yet

Exploits

10 known

EPSS Exploitation Probability

via FIRST.org ↗

94.3%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

NETGEAR R6250 before 1.0.4.6.Beta, R6400 before 1.0.1.18.Beta, R6700 before 1.0.1.14.Beta, R6900, R7000 before 1.0.7.6.Beta, R7100LG before 1.0.0.28.Beta, R7300DST before 1.0.0.46.Beta, R7900 before 1.0.1.8.Beta, R8000 before 1.0.3.26.Beta, D6220, D6400, D7000, and possibly other routers allow remote attackers to execute arbitrary commands via shell metacharacters in the path info to cgi-bin/.

Affected Products

11 products · 11 configurations

d6220 firmwarenetgear

≤ 1.0.0.22

range

d6400 firmwarenetgear

≤ 1.0.0.56

range

r6250 firmwarenetgear

≤ 1.0.4.6_10.1.12

range

r6400 firmwarenetgear

≤ 1.0.1.18

range

r6700 firmwarenetgear

≤ 1.0.1.14

range

r6900 firmwarenetgear

≤ 1.0.1.14

range

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-41598remotecgi✓ Verified

Netgear R7000 / R6400 - 'cgi-bin' Command Injection (Metasploit)

by Metasploit · Mar 13, 2017

Exploit-DB Source

EDB-40889webappscgi✓ Verified

Netgear R7000 - Command Injection

by Acew0rm · Dec 7, 2016

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2016-6277 in your stack?

O3 detects CVE-2016-6277 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works

CVSS Score

8.8/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Network

AC:Attack Complexity

Low

PR:Privileges Required

None

UI:User Interaction

Required

S:Scope

Unchanged

C:Confidentiality

High

I:Integrity

High

A:Availability

High

Raw vector

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

CWE Classification

CWE-352Cross-Site Request Forgery (CSRF)

Weaponization

Timeline

Disclosed

Dec 14, 2016

First exploit

Mar 13, 2017

KEV added

Mar 7, 2022

Last updated

Apr 21, 2026

Identifiers

CVE-2016-6277

References

Advisorysecurityfocus.com Advisorysj-vs.net Advisoryexploit-db.com Advisorykb.cert.org Advisorysecurityfocus.com Advisorysj-vs.net Advisoryexploit-db.com Advisorykb.cert.org Fixkb.netgear.com Fixkb.netgear.com Exploit / PoCpacketstormsecurity.com Exploit / PoCkalypto.org Exploit / PoCexploit-db.com Exploit / PoCpacketstormsecurity.com Exploit / PoCkalypto.org Exploit / PoCexploit-db.com Webcisa.gov

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