CVE-2026-3703

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.82% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 54.5% of scored records. A rank, not a probability.

NVD base score

8.9 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-03-08 04:32Z6 MO AGO

Last updated

2026-03-10 14:00Z5 MO AGO

Reserved

2026-03-07

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

754820fde266c3be9d0d483bad92976432e5207d96408eea662c091cb1326746

• vuldb.comVDB-349649 | Wavlink NU516U1 login.cgi sub_401A10 out-of-bounds writehttps://vuldb.com/?id.349649vdb-entrytechnical-description
• vuldb.comVDB-349649 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/?ctiid.349649signaturepermissions-required
• vuldb.comSubmit #759226 | Wavlink NU516U1 V251208 Stack-based Buffer Overflowhttps://vuldb.com/?submit.759226third-party-advisory
• github.comhttps://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.mdrelated
• github.comhttps://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md#exp-exploit--pocexploit
• dl.wavlink.comhttps://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-02-27-2fcf6ae-mt7628-squashfs-sysupgrade.binpatch