Which products and versions are affected by CVE-2019-9955?

Affected: Atp200 Firmware (Zyxel) versions 4.31; Atp500 Firmware (Zyxel) versions 4.31; Atp800 Firmware (Zyxel) versions 4.31, among others. The full list is in the CVE brief.

Is CVE-2019-9955 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2019-9955 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2019-9955?

Public exploit code is available.

Is there a fix for CVE-2019-9955?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2019-9955 be patched?

Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

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CVE-2019-9955Atp200 Firmware XSS

On Zyxel ATP200, ATP500, ATP800, USG20-VPN, USG20W-VPN, USG40, USG40W, USG60, USG60W, USG110, USG210, USG310, USG1100, USG1900, USG2200-VPN, ZyWALL 110, ZyWALL 310, ZyWALL 1100 devices, the security firewall login page is vulnerable to Reflected XSS via the unsanitized 'mp_idx'…

Published Apr 22, 2019 · Updated Nov 21, 2024

Key Facts

Routine patching

CVE-2019-9955 is a medium-severity vulnerability (CVSS 6.1 v3) affecting Atp200 Firmware (Zyxel), Atp500 Firmware (Zyxel), Atp800 Firmware (Zyxel) and 18 more products.
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 21% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

Scores

CVSS v3

6.1

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS (30-day exploit likelihood)

21%

Higher than 97.5% of all scored CVEs

Exploit maturity

Proof of concept

ATLAS score

53/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Not listed

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Proof of concept

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Advisories And Exploit References

Description

Affected Products

21 affected entries in total

Product	Affected versions	Fixed in
Atp200 FirmwareZyxel	4.31	n/a
Atp500 FirmwareZyxel	4.31	n/a
Atp800 FirmwareZyxel	4.31	n/a
Usg1100 FirmwareZyxel	4.31	n/a
Usg110 FirmwareZyxel	4.31	n/a

16 more affected products in the full CVE brief

Timeline

Publicly disclosed
Apr 22, 2019
Last updated
Nov 21, 2024

Weakness Type

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References

1 more references in the full CVE brief

FAQ

Common Questions.

On Zyxel ATP200, ATP500, ATP800, USG20-VPN, USG20W-VPN, USG40, USG40W, USG60, USG60W, USG110, USG210, USG310, USG1100, USG1900, USG2200-VPN, ZyWALL 110, ZyWALL 310, ZyWALL 1100 devices, the security firewall login page is vulnerable to Reflected XSS via the unsanitized 'mp_idx' parameter.
Affected: Atp200 Firmware (Zyxel) versions 4.31; Atp500 Firmware (Zyxel) versions 4.31; Atp800 Firmware (Zyxel) versions 4.31, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

Is CVE-2019-9955 On Your Attack Surface?

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.