CVE-2019-15804
No known exploitation. EPSS puts it in the 59th percentile. A vendor fix is available.
What to do
The vendor has published a fix. Version details are below where the sources state them.
What it is
From the CVE record
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. By sending a signal to the CLI process, undocumented functionality is triggered. Specifically, a menu can be triggered by sending the SIGQUIT signal to the CLI application (e.g., through CTRL+\ via SSH). The access control check for this menu does work and prohibits accessing the menu, which contains "Password recovery for specific user" options. The menu is believed to be accessible using a serial console.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.9% chance of exploitation activity in the next 30 days, which ranks it in the 59th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
4 events over 1834 days, from the signal feeds we watch.
- Patch availablerecord updated
- Publishedweakness classified
Affected products
- gs1900-8 firmwareNetworking Infrastructure
- gs1900-8hp firmwareNetworking Infrastructure
- gs1900-10hp firmwareNetworking Infrastructure
- gs1900-16 firmwareNetworking Infrastructure
- gs1900-24e firmwareNetworking Infrastructure
- gs1900-24 firmwareNetworking Infrastructure
- gs1900-24hp firmwareNetworking Infrastructure
- gs1900-48 firmwareNetworking Infrastructure
And 11 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Scored 7.5 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality NoneNo confidentiality impact
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability NoneNo availability impact
Weaknesses
Sources
References in the record
- jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html
- zyxel.com/support/gs1900-switch-vulnerabilities.shtml
- nvd.nist.gov/vuln/detail/CVE-2019-15804&
And 1 more reference. See all after sign-in
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