Medium severity5.3NVD Advisory· Published Nov 18, 2025· Updated Jun 17, 2026

CVE-2025-6599

Description

An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could allow an attacker to perform Slowloris‑style denial‑of‑service (DoS) attacks. Such attacks may temporarily block legitimate HTTP requests and partially disrupt access to the web management interface, while other networking services remain unaffected.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Zyxel/Ax7501 B0 Firmware
cpe:2.3:o:zyxel:ax7501-b0_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abpc.6.1\)c0
Zyxel/Ax7501 B1 Firmware
cpe:2.3:o:zyxel:ax7501-b1_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abpc.6.1\)c0
Zyxel/Dm4200 B0 Firmware
cpe:2.3:o:zyxel:dm4200-b0_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(acbs.1.3\)c0
Zyxel/Dx3300 T0 Firmware
cpe:2.3:o:zyxel:dx3300-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abvy.6.3\)c0
Zyxel/Dx3300 T1 Firmware
cpe:2.3:o:zyxel:dx3300-t1_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abvy.6.3\)c0
Zyxel/Dx3301 T0 Firmware2 versions
cpe:2.3:o:zyxel:dx3301-t0_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:zyxel:dx3301-t0_firmware:*:*:*:*:*:*:*:*range: <=5.50\(abvy.6.3\)c0
- (no CPE)range: <= 5.50(ABVY.6.3)C0
Zyxel/Dx4510 B1 Firmware
cpe:2.3:o:zyxel:dx4510-b1_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abyl.9\)c0
Zyxel/Dx5401 B0 Firmware
cpe:2.3:o:zyxel:dx5401-b0_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abyo.7\)b2
Zyxel/Dx5401 B1 Firmware
cpe:2.3:o:zyxel:dx5401-b1_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abyo.7\)b2
Zyxel/Ee3301 00 Firmware
cpe:2.3:o:zyxel:ee3301-00_firmware:*:*:*:*:*:*:*:*
Range: <=5.63\(acmu.1.1\)c0
Zyxel/Ee5301 00 Firmware
cpe:2.3:o:zyxel:ee5301-00_firmware:*:*:*:*:*:*:*:*
Range: <=5.63\(acld.1.1\)c0
Zyxel/Ee6510 10 Firmware
cpe:2.3:o:zyxel:ee6510-10_firmware:*:*:*:*:*:*:*:*
Range: <=5.19\(acjq.3\)c0
Zyxel/Emg3525 T50b Firmware
cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abpm.9.5\)c0
Zyxel/Emg5523 T50b Firmware
cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abpm.9.5\)c0
Zyxel/Emg5723 T50k Firmware
cpe:2.3:o:zyxel:emg5723-t50k_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abom.8.6\)c0
Zyxel/Emg6726 B10a Firmware
cpe:2.3:o:zyxel:emg6726-b10a_firmware:*:*:*:*:*:*:*:*
Range: <=5.13\(abnp.8\)c0
Zyxel/Ex3300 T0 Firmware
cpe:2.3:o:zyxel:ex3300-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abvy.6.3\)c0
Zyxel/Ex3300 T1 Firmware
cpe:2.3:o:zyxel:ex3300-t1_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abvy.6.3\)c0
Zyxel/Ex3301 T0 Firmware
cpe:2.3:o:zyxel:ex3301-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abvy.6.3\)c0
Zyxel/Ex3500 T0 Firmware
cpe:2.3:o:zyxel:ex3500-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.44\(achr.4\)c0
Zyxel/Ex3501 T0 Firmware
cpe:2.3:o:zyxel:ex3501-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.44\(achr.4\)c0
Zyxel/Ex3600 T0 Firmware
cpe:2.3:o:zyxel:ex3600-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.70\(acif.1.2\)c0
Zyxel/Ex5401 B0 Firmware
cpe:2.3:o:zyxel:ex5401-b0_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abyo.7\)b2
Zyxel/Ex5401 B1 Firmware
cpe:2.3:o:zyxel:ex5401-b1_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abyo.7\)b2
Zyxel/Ex5501 B0 Firmware
cpe:2.3:o:zyxel:ex5501-b0_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abry.5.5\)c0
Zyxel/Ex5510 B0 Firmware
cpe:2.3:o:zyxel:ex5510-b0_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abqx.10\)c0
Zyxel/Ex5512 T0 Firmware
cpe:2.3:o:zyxel:ex5512-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.70\(aceg.5\)c0
Zyxel/Ex5601 T0 Firmware
cpe:2.3:o:zyxel:ex5601-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.70\(acdz.4.1\)c0
Zyxel/Ex5601 T1 Firmware
cpe:2.3:o:zyxel:ex5601-t1_firmware:*:*:*:*:*:*:*:*
Range: <=5.70\(acdz.4.1\)c0
Zyxel/Ex7501 B0 Firmware
cpe:2.3:o:zyxel:ex7501-b0_firmware:*:*:*:*:*:*:*:*
Range: <=5.18\(achn.2.1\)c0
Zyxel/Ex7710 B0 Firmware
cpe:2.3:o:zyxel:ex7710-b0_firmware:*:*:*:*:*:*:*:*
Range: <=5.18\(acak.1.4\)c0
Zyxel/Gm4100 B0 Firmware
cpe:2.3:o:zyxel:gm4100-b0_firmware:*:*:*:*:*:*:*:*
Range: <=5.18\(accl.1\)c0
Zyxel/Lte3301 Plus Firmware
cpe:2.3:o:zyxel:lte3301-plus_firmware:*:*:*:*:*:*:*:*
Range: <=1.00\(abqu.7\)c0
Zyxel/Nebula Fwa505 Firmware
cpe:2.3:o:zyxel:nebula_fwa505_firmware:*:*:*:*:*:*:*:*
Range: <=1.19\(acko.0\)c0
Zyxel/Nebula Fwa510 Firmware
cpe:2.3:o:zyxel:nebula_fwa510_firmware:*:*:*:*:*:*:*:*
Range: <=1.20\(acgd.1\)c0
Zyxel/Nebula Fwa515 Firmware
cpe:2.3:o:zyxel:nebula_fwa515_firmware:*:*:*:*:*:*:*:*
Range: <=1.50\(acpz.0\)c0
Zyxel/Nebula Fwa710 Firmware
cpe:2.3:o:zyxel:nebula_fwa710_firmware:*:*:*:*:*:*:*:*
Range: <=1.20\(acgc.0\)c0
Zyxel/Nr5103 Firmware
cpe:2.3:o:zyxel:nr5103_firmware:*:*:*:*:*:*:*:*
Range: <=4.19\(abyc.8\)c0
Zyxel/Nr5103e Firmware
cpe:2.3:o:zyxel:nr5103e_firmware:*:*:*:*:*:*:*:*
Range: <=1.00\(acdj.1\)c0
Zyxel/Nr5309 Firmware
cpe:2.3:o:zyxel:nr5309_firmware:*:*:*:*:*:*:*:*
Range: <=1.00\(ackp.1\)b3
Zyxel/Nr7302 Firmware
cpe:2.3:o:zyxel:nr7302_firmware:*:*:*:*:*:*:*:*
Range: <=5.00\(acha.5\)c0
Zyxel/Nr7303 Firmware
cpe:2.3:o:zyxel:nr7303_firmware:*:*:*:*:*:*:*:*
Range: <=1.00\(acei.1\)c0
Zyxel/Pe3301 00 Firmware
cpe:2.3:o:zyxel:pe3301-00_firmware:*:*:*:*:*:*:*:*
Range: <=5.63\(acmt.1.1\)c0
Zyxel/Pe5301 01 Firmware
cpe:2.3:o:zyxel:pe5301-01_firmware:*:*:*:*:*:*:*:*
Range: <=5.63\(acoj.1.1\)c0
Zyxel/Pm3100 T0 Firmware
cpe:2.3:o:zyxel:pm3100-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.42\(acbf.3\)c0
Zyxel/Pm5100 T0 Firmware
cpe:2.3:o:zyxel:pm5100-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.42\(acbf.3\)c0
Zyxel/Pm7300 T0 Firmware
cpe:2.3:o:zyxel:pm7300-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.42\(abyy.3\)c0
Zyxel/Pm7500 00 Firmware
cpe:2.3:o:zyxel:pm7500-00_firmware:*:*:*:*:*:*:*:*
Range: <=5.61\(ackk.1\)c0
Zyxel/Px3321 T1 Firmware
cpe:2.3:o:zyxel:px3321-t1_firmware:*:*:*:*:*:*:*:*
Range: <=5.44\(acjb.1.3\)c0
Zyxel/Px5301 T0 Firmware
cpe:2.3:o:zyxel:px5301-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.44\(ackb.0.4\)c0
Zyxel/Scr50axe Firmware
cpe:2.3:o:zyxel:scr_50axe_firmware:*:*:*:*:*:*:*:*
Range: <=1.10\(acgn.3\)c0
Zyxel/Vmg3625 T50b Firmware
cpe:2.3:o:zyxel:vmg3625-t50b_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abpm.9.5\)c0
Zyxel/Vmg3927 B50b Firmware
cpe:2.3:o:zyxel:vmg3927-b50b_firmware:*:*:*:*:*:*:*:*
Range: <=5.13\(ably.10\)c0
Zyxel/Vmg3927 T50k Firmware
cpe:2.3:o:zyxel:vmg3927-t50k_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abom.8.6\)c0
Zyxel/Vmg4005 B50a Firmware
cpe:2.3:o:zyxel:vmg4005-b50a_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abqa.3\)c0
Zyxel/Vmg4005 B50b Firmware
cpe:2.3:o:zyxel:vmg4005-b50b_firmware:*:*:*:*:*:*:*:*
Range: <=5.13\(abrl.5.3\)c0
Zyxel/Vmg4005 B60a Firmware
cpe:2.3:o:zyxel:vmg4005-b60a_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abqa.3\)c0
Zyxel/Vmg4927 B50a Firmware
cpe:2.3:o:zyxel:vmg4927-b50a_firmware:*:*:*:*:*:*:*:*
Range: <=5.13\(ably.10\)c0
Zyxel/Vmg8623 T50b Firmware
cpe:2.3:o:zyxel:vmg8623-t50b_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abpm.9.5\)c0
Zyxel/Vmg8825 T50k Firmware
cpe:2.3:o:zyxel:vmg8825-t50k_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abom.8.6\)c0
Zyxel/We3300 00 Firmware
cpe:2.3:o:zyxel:we3300-00_firmware:*:*:*:*:*:*:*:*
Range: <=5.70\(acka.0\)c0
Zyxel/Wx3100 T0 Firmware
cpe:2.3:o:zyxel:wx3100-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.50\(abvl.4.7\)c0
Zyxel/Wx3401 B0 Firmware
cpe:2.3:o:zyxel:wx3401-b0_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abve.2.8\)c0
Zyxel/Wx3401 B1 Firmware
cpe:2.3:o:zyxel:wx3401-b1_firmware:*:*:*:*:*:*:*:*
Range: <=5.17\(abve.2.8\)c0
Zyxel/Wx5600 T0 Firmware
cpe:2.3:o:zyxel:wx5600-t0_firmware:*:*:*:*:*:*:*:*
Range: <=5.70\(aceb.4.1\)c0
Zyxel/Wx5610 B0 Firmware
cpe:2.3:o:zyxel:wx5610-b0_firmware:*:*:*:*:*:*:*:*
Range: <=5.18\(acgj.0.3\)c0
Zyxel/DX3301-T0llm-create
Range: <=5.50(ABVY.6.3)C0

Patches

Vulnerability mechanics

References

www.zyxel.com/global/en/support/security-advisories/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-11-18-2025nvdVendor Advisory

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