CVE-2025-6599 is an uncontrolled resource consumption vulnerability affecting Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier. An unauthenticated attacker can exploit this flaw remotely to launch Slowloris-style denial-of-service (DoS) attacks against the device's web server. This can temporarily block legitimate HTTP requests and disrupt access to the web management interface, though other networking services remain unaffected. The vulnerability has a CVSS score of 7.5 HIGH, indicating a significant impact on availability with low attack complexity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 1.00\(abqu.7\)c0CPE matchmatch criteria | cpe:2.3:o:zyxel:lte3301-plus_firmware:*:*:*:*:*:*:*:* | ||
<= 4.19\(abyc.8\)c0CPE matchmatch criteria | cpe:2.3:o:zyxel:nr5103_firmware:*:*:*:*:*:*:*:* | ||
<= 1.00\(acdj.1\)c0CPE matchmatch criteria | cpe:2.3:o:zyxel:nr5103e_firmware:*:*:*:*:*:*:*:* | ||
<= 1.00\(ackp.1\)b3CPE matchmatch criteria | cpe:2.3:o:zyxel:nr5309_firmware:*:*:*:*:*:*:*:* | ||
<= 5.00\(acha.5\)c0CPE matchmatch criteria | cpe:2.3:o:zyxel:nr7302_firmware:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Zyxel security advisory for uncontrolled resource consumption and command injection vulnerabilities in certain 4G LTE/5G NR CPE, DSL/Ethernet CPE, Fiber ONTs, Security Routers, and Wireless Extenders
Nov 18, 2025Zyxel security advisory for uncontrolled resource consumption and command injection vulnerabilities in certain 4G LTE/5G NR CPE, DSL/Ethernet CPE, Fiber ONTs, Security Routers, and Wireless Extenders
Nov 18, 2025