CVE-2020-25014
CRITICAL
9.8
CVSS Score
Published: November 27, 2020 at 05:18 PM UTC
Updated: June 17, 2026 at 03:06 AM UTC
52 products affected across 1 vendorZldAccess Points FirmwareUsg Flex 200
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Severity
CRITICAL9.8
Exploit prediction
EPSS 4%
Description
A stack-based buffer overflow in fbwifi_continue.cgi on Zyxel UTM and VPN series of gateways running firmware version V4.30 through to V4.55 allows remote unauthenticated attackers to execute arbitrary code via a crafted http packet.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
zyxel-nwa110ax (environment) · zyxel-nwa1123-ac-hd (environment) · zyxel-nwa1123-ac-pro (environment) · zyxel-nwa1123-acv2 (environment) · zyxel-nwa1302-ac (environment) · zyxel-nwa210ax (environment) · zyxel-nwa5120 (environment) · zyxel-nwa5301-nj (environment) · zyxel-wac5302d-s (environment) · zyxel-wac6100 (environment) · zyxel-wac6303d-s (environment) · zyxel-wac6500 (environment) · zyxel-wac6550 (environment) · zyxel-wax510d (environment) · zyxel-wax610d (environment) · zyxel-wax650s (environment)
4.30 ≤ v ≤ 4.55
zyxel-usg-110 (environment) · zyxel-usg-1100 (environment) · zyxel-usg-1900 (environment) · zyxel-usg-20w (environment) · zyxel-usg-20w-vpn (environment) · zyxel-usg-2200-vpn (environment) · zyxel-usg-310 (environment) · zyxel-usg-40 (environment) · zyxel-usg-40w (environment) · zyxel-usg-60 (environment) · zyxel-usg-60w (environment) · zyxel-usg-flex-100 (environment) · zyxel-usg-flex-100w (environment) · zyxel-usg-flex-200 (environment) · zyxel-usg-flex-500 (environment) · zyxel-usg-flex-700 (environment) · zyxel-usg110 (environment) · zyxel-usg1100 (environment) · zyxel-usg1900 (environment) · zyxel-usg20-vpn (environment) · zyxel-usg20w-vpn (environment) · zyxel-usg210 (environment) · zyxel-usg2200-vpn (environment) · zyxel-usg310 (environment) · zyxel-usg40 (environment) · zyxel-usg40w (environment) · zyxel-usg60 (environment) · zyxel-usg60w (environment) · zyxel-vpn100 (environment) · zyxel-vpn300 (environment) · zyxel-vpn50 (environment) · zyxel-zywall-110 (environment) · zyxel-zywall-1100 (environment) · zyxel-zywall-310 (environment)
Nwa1123-Ac Hd· Zyxeldevice
80%All versions
Nwa1123-Ac Pro· Zyxeldevice
80%All versions
Nwa1123-Acv2· Zyxeldevice
80%All versions
Nwa1302-Ac· Zyxeldevice
80%All versions
Nwa5301-Nj· Zyxeldevice
80%All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (2)
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://businessforum.zyxel.com/categories/security-news-and-releasex_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://www.zyxel.com/support/Zyxel-security-advisory-for-buffer-overflow-vulnerability.shtmlCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-787
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