What is the CVSS score of CVE-2026-3613?

CVE-2026-3613 has a CVSS 3.1 base score of 7.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2026-3613?

Yes, a public proof-of-concept exploit is available for CVE-2026-3613. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-3613?

Within 24 hours: Inventory all Wavlink WL-NU516U1 V240425 devices in production; isolate or disable internet-facing instances; implement network access controls limiting login.cgi access to trusted administrative subnets only. Within 7 days: Deploy WAF rules blocking suspicious requests to /cgi-bin/login.cgi; consider firmware downgrade if earlier versions are unaffected; engage Wavlink support for patch ETA. Within 30 days: Replace affected devices with alternative vendors or deploy replacement firmware if available; conduct access logs review for exploitation evidence.

Wl Nu516u1 Firmware CVE-2026-3613

HIGH

Buffer Overflow (CWE-119)

2026-03-06 cna@vuldb.com

Buffer Overflow Stack Overflow Wl Nu516u1 Firmware Wavlink

7.2

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send crafted HTTP request to /cgi-bin/login.cgi
Exploit

Inject oversized ipaddr parameter
Execution

Overflow stack buffer in sub_401A0C
Impact

Execute arbitrary code with device privileges

Vulnerability Assessment

Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Wavlink WL-NU516U1 firmware V240425; attacker must possess administrative credentials (PR:H); vulnerable /cgi-bin/login.cgi endpoint must be accessible; stack-based buffer overflow triggered via ipaddr parameter manipulation.
Impact	CVSS 7.2 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: High. User interaction: None. Exploitable via remote/network. Public exploit/POC available.
Exploit ScenarioDerived	A remote attacker could exploit this flaw, stack-based buffer overflow.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Stack-based buffer overflow in Wavlink WL-NU516U1 firmware's login.cgi allows remote attackers with high privileges to achieve complete system compromise through a malformed ipaddr parameter. Public exploit code exists for this vulnerability, and no patch is currently available. The flaw enables unauthenticated remote code execution with full read, write, and execution capabilities on affected devices.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:06 CVSS 7.2

A vulnerability was identified in Wavlink WL-NU516U1 V240425. This vulnerability affects the function sub_401A0C of the file /cgi-bin/login.cgi. [CVSS 7.2 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-119 (Buffer Overflow). Affects Wl-Nu516U1 Firmware. A vulnerability was identified in Wavlink WL-NU516U1 V240425. This vulnerability affects the function sub_401A0C of the file /cgi-bin/login.cgi. Such manipulation of the argument ipaddr leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.2 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Mar 10, 2026 - 18:30 vuln.today

Public exploit code

CVE Published

Mar 06, 2026 - 02:15 nvd

HIGH 7.2

DescriptionCVE.org

A vulnerability was identified in Wavlink WL-NU516U1 V240425. This vulnerability affects the function sub_401A0C of the file /cgi-bin/login.cgi. Such manipulation of the argument ipaddr leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.

Executive ViewAI

Why It Matters

A HIGH severity vulnerability (CVE-2026-3613) in Wavlink WL-NU516U1 wireless access points allows unauthenticated attackers to exploit the login function, potentially compromising network access controls. Organizations deploying this device model face immediate risk of unauthorized access to network infrastructure. With public exploits available and no vendor patch released, this poses a critical threat requiring urgent mitigation.

Business Impact: High

Compensating Controls

Implement network segmentation to restrict access to /cgi-bin/login.cgi from administrative networks only; deploy WAF rules to detect and block exploitation patterns; disable remote management interfaces where possible; enforce strong authentication on adjacent network controls; monitor access logs for brute-force or exploitation attempts; consider disabling the device until patch availability or replacement planning is complete.

Threat Intelligence Overview

EPSS Score

0.1%

Top 74% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +36

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Stack-based Buffer Overflow HIGH

A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.