Medium severity · published Jul 26, 2021
CVE-2021-35030
A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize packet contents and could allow an authenticated, local user…
4.3
CVSS
0.3%
EPSS
No
On KEV
Description
A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize packet contents and could allow an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack vector
Adjacent
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GF
Gs1900-10hp Firmware · Zyxel
before 2.70 · source: NVD
GF
Gs1900-16 Firmware · Zyxel
before 2.70 · source: NVD
GF
Gs1900-24 Firmware · Zyxel
before 2.70 · source: NVD
GF
Gs1900-24e Firmware · Zyxel
before 2.70 · source: NVD
GF
Gs1900-24ep Firmware · Zyxel
before 2.70 · source: NVD
GF
Gs1900-24hp Firmware · Zyxel
before 2.70 · source: NVD
GF
Gs1900-24hpv2 Firmware · Zyxel
before 2.70 · source: NVD
GF
Gs1900-48 Firmware · Zyxel
before 2.70 · source: NVD
GF
Gs1900-48hp Firmware · Zyxel
before 2.70 · source: NVD
GF
Gs1900-48hpv2 Firmware · Zyxel
before 2.70 · source: NVD
GF
Gs1900-8 Firmware · Zyxel
before 2.70 · source: NVD
GF
Gs1900-8hp Firmware · Zyxel
before 2.70 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-35030
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-35030
Patch
https://www.zyxel.com/support/Zyxel_security_advisory_for_XSS_vulnerability_of_GS1900_series_switches.shtml
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