CVE-2026-13539

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-29. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A vulnerability was identified in Wavlink WL-NU516U1-A M16U1_V240425. The impacted element is the function sub_407504 of the file /cgi-bin/wireless.cgi of the component POST Parameter Handler. Such manipulation of the argument Guest_ssid leads to stack-based buffer overflow. The attack can be executed remotely. The exploit is publicly available and might be used. It is suggested to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

CVSS v3
8.8
EG Score
8.8(high)
EPSS
37.1%
KEV
Not listed

Published

June 29, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Jun 29, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Wavlink_vul/wavlink-wl-nu516u1-wireless-guestwifi-guestssid-buffer-overflow at main · Svigo-o/Wavlink_vul · GitHub

https://github.com/Svigo-o/Wavlink_vul/tree/main/wavlink-wl-nu516u1-wireless-guestwifi-guestssid-buffer-overflow

Vendor Advisories for CVE-2026-13539(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 36× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 04:12 UTCEG score recompute
  2. 2026-07-07 04:12 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 15:34 UTCEG score recompute
  5. 2026-07-06 15:33 UTCGHSA enrichment
  6. 2026-07-06 02:59 UTCEG score recompute
  7. 2026-07-06 02:58 UTCGHSA enrichment
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 14:25 UTCEG score recompute
  10. 2026-07-05 14:25 UTCGHSA enrichment
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-05 02:30 UTCEPSS rescore
  13. 2026-07-05 01:51 UTCEG score recompute
  14. 2026-07-05 01:51 UTCGHSA enrichment
  15. 2026-07-04 13:15 UTCEG score recompute
  16. 2026-07-04 13:15 UTCGHSA enrichment
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-04 00:41 UTCEG score recompute
  19. 2026-07-04 00:41 UTCGHSA enrichment
  20. 2026-07-03 12:05 UTCEG score recompute
  21. 2026-07-03 12:04 UTCGHSA enrichment
  22. 2026-07-02 23:08 UTCEG score recompute
  23. 2026-07-02 23:08 UTCGHSA enrichment
  24. 2026-07-02 10:34 UTCEG score recompute
  25. 2026-07-02 10:34 UTCGHSA enrichment
Show 19 more
  1. 2026-07-01 21:56 UTCEG score recompute
  2. 2026-07-01 21:56 UTCGHSA enrichment
  3. 2026-07-01 15:06 UTCEPSS rescore
  4. 2026-07-01 15:06 UTCEPSS rescore
  5. 2026-07-01 09:20 UTCEG score recompute
  6. 2026-07-01 09:20 UTCGHSA enrichment
  7. 2026-06-30 23:22 UTCEPSS rescore
  8. 2026-06-30 20:44 UTCEG score recompute
  9. 2026-06-30 20:44 UTCGHSA enrichment
  10. 2026-06-30 08:10 UTCEG score recompute
  11. 2026-06-30 08:10 UTCGHSA enrichment
  12. 2026-06-29 19:36 UTCEG score recompute
  13. 2026-06-29 19:36 UTCGHSA enrichment
  14. 2026-06-29 17:26 UTCNVD updateCVSS v4 → 7.4
  15. 2026-06-29 16:13 UTCMITRE cvelistV5CVSS v4 → 8.7
  16. 2026-06-29 14:06 UTCEPSS rescore
  17. 2026-06-29 08:04 UTCNVD updateCVSS v4 → 7.4
  18. 2026-06-29 07:02 UTCEG score recompute
  19. 2026-06-29 07:02 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13539?
CVE-2026-13539 is a high vulnerability published on June 29, 2026. A vulnerability was identified in Wavlink WL-NU516U1-A M16U1V240425. The impacted element is the function sub407504 of the file /cgi-bin/wireless.cgi of the component POST Parameter Handler. Such manipulation of the argument Guest_ssid leads to stack-based buffer overflow. The attack can be…
When was CVE-2026-13539 disclosed?
CVE-2026-13539 was first published in the National Vulnerability Database on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13539 actively exploited?
CVE-2026-13539 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-13539?
CVE-2026-13539 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-13539?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13539, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-13539

Explore →

Is Your Infrastructure Affected by CVE-2026-13539?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs