CVE-2026-13538

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 ImpactpartialSuccessful exploitation gives limited 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

2.18% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 81.0% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/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

Deferred. NVD last modified this record on 2026-06-29.

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

2026-06-29 05:15Z2 MO AGO

Last updated

2026-06-29 13:48Z2 MO AGO

Reserved

2026-06-28

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

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

Weaknesses

• CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')Class
• CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')Class

Data version

5.2

Document digest

da3b0bbcd309ec5a8829d05938d7cfebfd94ea8eb661826e3ee81df783491552

• vuldb.comVDB-374546 | Wavlink WL-NU516U1-A POST Parameter wireless.cgi sub_401D68 command injectionhttps://vuldb.com/vuln/374546vdb-entrytechnical-description
• vuldb.comVDB-374546 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/vuln/374546/ctisignaturepermissions-required
• vuldb.comCVE-2026-13538 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-13538third-party-advisory
• vuldb.comSubmit #834019 | Wavlink WL-NU516U1-A M16U1_V240425 Command Injectionhttps://vuldb.com/submit/834019third-party-advisory
• vuldb.comSubmit #834021 | Wavlink WL-NU516U1-A M16U1_V240425 Command Injection (Duplicate)https://vuldb.com/submit/834021third-party-advisory
• vuldb.comSubmit #834022 | Wavlink WL-NU516U1-A M16U1_V240425 Command Injection (Duplicate)https://vuldb.com/submit/834022third-party-advisory
• vuldb.comSubmit #834023 | Wavlink WL-NU516U1-A M16U1_V240425 Command Injection (Duplicate)https://vuldb.com/submit/834023third-party-advisory
• github.comhttps://github.com/Svigo-o/Wavlink_vul/tree/main/wavlink-wl-nu516u1-wireless-multissid-ssid2g2-command-injectionrelated
• github.comhttps://github.com/Svigo-o/Wavlink_vul/tree/main/wavlink-wl-nu516u1-wireless-multissid-ssid5g2-command-injectionexploit
• dl.wavlink.comhttps://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-06-22-5ccde97-mt7628-squashfs-sysupgrade.binpatch