CVE-2024-39363Public exploitNetwork attack vector

Administrator session theft via stored language injection

Published Jan 14, 2025 · Updated Jan 14, 2025

Persistent XSS in Wavlink AC3000 M33A8.V5030.210505 allows remote attackers to steal administrator session cookies through login.cgi. The set_lang_CountryCode function stores the unencoded langue POST value in the Language NVRAM item, which login pages embed directly in script output. Network access is sufficient to plant the value without authentication, but an administrator must load an affected page to execute it; the same injection can interrupt login service.

CVSS severity9.6
Critical
EPSS probability48.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Persistent XSS in Wavlink AC3000 M33A8.V5030.210505 allows remote attackers to steal administrator session cookies through login.cgi. The set_lang_CountryCode function stores the unencoded langue POST value in the Language NVRAM item, which login pages embed directly in script output. Network access is sufficient to plant the value without authentication, but an administrator must load an affected page to execute it; the same injection can interrupt login service.

The record

CVE
CVE-2024-39363
Published
Jan 14, 2025
Updated
Jan 14, 2025
Vendor
Wavlink
Product
AC3000 Tri-band Wi-Fi Router
Classifications
CWE-80, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=M33A8.V5030.210505

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wavlink · AC3000 Tri-band Wi-Fi Routerversion=M33A8.V5030.210505

Published CVSS scores

9.6Cisco TalosCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1539Steal Web Session Cookie

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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