CVE-2025-6599

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.

• zyxel lte3301-plus firmware (<= 1.00\(abqu.7\)c0) • zyxel nr5103 firmware (<= 4.19\(abyc.8\)c0) • zyxel nr5103e firmware (<= 1.00\(acdj.1\)c0) • zyxel nr5309 firmware (<= 1.00\(ackp.1\)b3) • zyxel nr7302 firmware (<= 5.00\(acha.5\)c0) • zyxel nr7303 firmware (<= 1.00\(acei.1\)c0) • zyxel nebula fwa505 firmware (<= 1.19\(acko.0\)c0) • zyxel nebula fwa510 firmware (<= 1.20\(acgd.1\)c0) • zyxel nebula fwa515 firmware (<= 1.50\(acpz.0\)c0) • zyxel nebula fwa710 firmware (<= 1.20\(acgc.0\)c0) • zyxel dm4200-b0 firmware (<= 5.17\(acbs.1.3\)c0) • zyxel dx3300-t0 firmware (<= 5.50\(abvy.6.3\)c0) • zyxel dx3300-t1 firmware (<= 5.50\(abvy.6.3\)c0) • zyxel dx3301-t0 firmware (<= 5.50\(abvy.6.3\)c0) • zyxel dx4510-b1 firmware (<= 5.17\(abyl.9\)c0) • zyxel dx5401-b0 firmware (<= 5.17\(abyo.7\)b2) • zyxel dx5401-b1 firmware (<= 5.17\(abyo.7\)b2) • zyxel ee3301-00 firmware (<= 5.63\(acmu.1.1\)c0) • zyxel ee5301-00 firmware (<= 5.63\(acld.1.1\)c0) • zyxel ee6510-10 firmware (<= 5.19\(acjq.3\)c0) • zyxel ex3300-t0 firmware (<= 5.50\(abvy.6.3\)c0) • zyxel ex3300-t0 firmware (<= 5.50\(acdi.2.1\)c0) • zyxel ex3300-t1 firmware (<= 5.50\(abvy.6.3\)c0) • zyxel ex3301-t0 firmware (<= 5.50\(abvy.6.3\)c0) • zyxel ex3500-t0 firmware (<= 5.44\(achr.4\)c0) • zyxel ex3501-t0 firmware (<= 5.44\(achr.4\)c0) • zyxel ex3600-t0 firmware (<= 5.70\(acif.1.2\)c0) • zyxel ex5401-b0 firmware (<= 5.17\(abyo.7\)b2) • zyxel ex5401-b1 firmware (<= 5.17\(abyo.7\)b2) • zyxel ex5501-b0 firmware (<= 5.17\(abry.5.5\)c0) • zyxel ex5510-b0 firmware (<= 5.17\(abqx.10\)c0) • zyxel ex5512-t0 firmware (<= 5.70\(aceg.5\)c0) • zyxel ex5601-t0 firmware (<= 5.70\(acdz.4.1\)c0) • zyxel ex5601-t1 firmware (<= 5.70\(acdz.4.1\)c0) • zyxel ex7501-b0 firmware (<= 5.18\(achn.2.1\)c0) • zyxel ex7710-b0 firmware (<= 5.18\(acak.1.4\)c0) • zyxel emg3525-t50b firmware (<= 5.50\(abpm.9.5\)c0) • zyxel emg5523-t50b firmware (<= 5.50\(abpm.9.5\)c0) • zyxel emg5723-t50k firmware (<= 5.50\(abom.8.6\)c0) • zyxel emg6726-b10a firmware (<= 5.13\(abnp.8\)c0) • zyxel gm4100-b0 firmware (<= 5.18\(accl.1\)c0) • zyxel vmg3625-t50b firmware (<= 5.50\(abpm.9.5\)c0) • zyxel vmg3927-b50b firmware (<= 5.13\(ably.10\)c0) • zyxel vmg3927-t50k firmware (<= 5.50\(abom.8.6\)c0) • zyxel vmg4005-b50a firmware (<= 5.17\(abqa.3\)c0) • zyxel vmg4005-b60a firmware (<= 5.17\(abqa.3\)c0) • zyxel vmg4005-b50b firmware (<= 5.13\(abrl.5.3\)c0) • zyxel vmg4927-b50a firmware (<= 5.13\(ably.10\)c0) • zyxel vmg8623-t50b firmware (<= 5.50\(abpm.9.5\)c0) • zyxel vmg8825-t50k firmware (<= 5.50\(abom.8.6\)c0) • zyxel ax7501-b0 firmware (<= 5.17\(abpc.6.1\)c0) • zyxel ax7501-b1 firmware (<= 5.17\(abpc.6.1\)c0) • zyxel pe3301-00 firmware (<= 5.63\(acmt.1.1\)c0) • zyxel pe5301-01 firmware (<= 5.63\(acoj.1.1\)c0) • zyxel pm3100-t0 firmware (<= 5.42\(acbf.3\)c0) • zyxel pm5100-t0 firmware (<= 5.42\(acbf.3\)c0) • zyxel pm7500-00 firmware (<= 5.61\(ackk.1\)c0) • zyxel pm7300-t0 firmware (<= 5.42\(abyy.3\)c0) • zyxel px3321-t1 firmware (<= 5.44\(acjb.1.3\)c0) • zyxel px3321-t1 firmware (<= 5.44\(achk.1\)c0) … and 8 more