CVE-2020-8430Network attack vector

Administrator credential theft via captive-portal open redirect

Published Apr 13, 2020 · Updated Aug 4, 2024

Open redirect in the Stormshield Network Security captive portal allows remote attackers to redirect administrators to a malicious site. The auth/lang.html endpoint accepts a protocol-relative attacker domain in the rurl parameter without restricting the redirect destination; affected releases are 3.0.0 through 3.7.10, 3.8.0 through 3.10.0, and 4.0.0 through 4.0.1. The nondefault captive portal must be enabled and an administrator must follow the crafted link, after which a counterfeit login page can capture the administrator password.

CVSS severity7.1
High
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in the Stormshield Network Security captive portal allows remote attackers to redirect administrators to a malicious site. The auth/lang.html endpoint accepts a protocol-relative attacker domain in the rurl parameter without restricting the redirect destination; affected releases are 3.0.0 through 3.7.10, 3.8.0 through 3.10.0, and 4.0.0 through 4.0.1. The nondefault captive portal must be enabled and an administrator must follow the crafted link, after which a counterfeit login page can capture the administrator password.

The record

CVE
CVE-2020-8430
Published
Apr 13, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-601, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.1StormshieldAV:N/AC:M/Au:N/C:C/I:N/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.9StormshieldAV:N/AC:M/Au:N/C:C/I:N/A:N/E:F/RL:OF/RC:C
5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1566.002Spearphishing Link

Public exploit references

No public exploit references are available in this record.

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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