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4.9
Zyxel VMG3625-T50B and WX3100-T0 firmware: DoS via crafted HTTP request
CVE-2025-11845
Summary
If an attacker with admin access sends a specially crafted HTTP request, it can cause a Zyxel VMG3625-T50B or WX3100-T0 router to become unresponsive, making it unavailable for use. This is a serious issue because it allows an attacker to disrupt service. To protect against this, upgrade to the latest firmware version or apply any available patches.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| zyxel | lte3301-plus_firmware | <= 1.00\(abqu.9\)c0 | – |
| zyxel | nebula_fwa505_firmware | <= 1.60\(acko.2\)v0 | – |
| zyxel | nebula_fwa510_firmware | <= 1.60\(acgd.0\)c0 | – |
| zyxel | nebula_fwa515_firmware | <= 1.60\(acpz.0\)v0 | – |
| zyxel | nebula_fwa710_firmware | <= 1.60\(acgc.1\)v0 | – |
| zyxel | ee5301-00_firmware | <= 5.63\(acld.2.1\)c0 | – |
| zyxel | ee3301-00_firmware | <= 5.63\(acmu.2.1\)c0 | – |
| zyxel | dx5401-b1_firmware | <= 5.17\(abyo.7.1\)c0 | – |
| zyxel | dx4510-b1_firmware | <= 5.17\(abyl.10.1\)c0 | – |
| zyxel | dx4510-b0_firmware | <= 5.17\(abyl.10.1\)c0 | – |
| zyxel | dx3301-t0_firmware | <= 5.50\(abvy.7.1\)c0 | – |
| zyxel | dx3300-t1_firmware | <= 5.50\(abvy.7.1\)c0 | – |
| zyxel | dx3300-t0_firmware | <= 5.50\(abvy.7.1\)c0 | – |
| zyxel | nebula_lte3301-plus_firmware | <= 1.18\(acca.6\)v0 | – |
| zyxel | ee6510-10_firmware | <= 5.19\(acjq.4.1\)c0 | – |
| zyxel | emg3525-t50b_firmware | <= 5.50\(abpm.9.7\)c0 | – |
| zyxel | emg5523-t50b_firmware | <= 5.50\(abpm.9.7\)c0 | – |
| zyxel | ex2210-t0_firmware | <= 5.50\(acdi.2.3\)c0 | – |
| zyxel | ex3300-t0_firmware | <= 5.50\(abvy.7.1\)c0 | – |
| zyxel | ex3300-t1_firmware | <= 5.50\(abvy.7.1\)c0 | – |
| zyxel | ex3301-t0_firmware | <= 5.50\(abvy.7.1\)c0 | – |
| zyxel | ex3500-t0_firmware | <= 5.44\(achr.5.1\)c0 | – |
| zyxel | ex3501-t0_firmware | <= 5.44\(achr.5.1\)c0 | – |
| zyxel | ex3510-b0_firmware | <= 5.17\(abup.15.2\)c0 | – |
| zyxel | ex3510-b1_firmware | <= 5.17\(abup.15.2\)c0 | – |
| zyxel | ex3600-t0_firmware | <= 5.70\(acif.2.1\)c0 | – |
| zyxel | ex5401-b1_firmware | <= 5.17\(abyo.7.1\)c0 | – |
| zyxel | ex5510-b0_firmware | <= 5.17\(abqx.11.1\)c0 | – |
| zyxel | ex5512-t0_firmware | <= 5.70\(aceg.5.3\)c0 | – |
| zyxel | ex5601-t0_firmware | <= 5.70\(acdz.5.1\)c0 | – |
| zyxel | ex5601-t1_firmware | <= 5.70\(acdz.5.1\)c0 | – |
| zyxel | ex7501-b0_firmware | <= 5.18\(achn.3.1\)c0 | – |
| zyxel | ex7710-b0_firmware | <= 5.18\(acak.1.6\)c0 | – |
| zyxel | gm4100-b0_firmware | <= 5.18\(accl.2\)c0 | – |
| zyxel | pm7500-00_firmware | <= 5.61\(ackk.1.2\)c0 | – |
| zyxel | vmg3625-t50b_firmware | <= 5.50\(abpm.9.7\)c0 | – |
| zyxel | vmg4005-b50a_firmware | <= 5.17\(abqa.3.2\)c0 | – |
| zyxel | vmg4005-b60a_firmware | <= 5.17\(abqa.3.2\)c0 | – |
| zyxel | ax7501-b1_firmware | <= 5.17\(abpc.7.1\)c0 | – |
| zyxel | pe3301-00_firmware | <= 5.63\(acmt.2.1\)c0 | – |
| zyxel | pe5301-01_firmware | <= 5.63\(acoj.2.1\)c0 | – |
| zyxel | pm3100-t0_firmware | <= 5.42\(acbf.4.1\)c0 | – |
| zyxel | pm5100-t0_firmware | <= 5.42\(acbf.4.1\)c0 | – |
| zyxel | pm5100-t1_firmware | <= 5.42\(acbf.4.1\)c0 | – |
| zyxel | pm7300-t0_firmware | <= 5.42\(abyy.4.1\)c0 | – |
| zyxel | px3321-t1_firmware | <= 5.44\(achk.3\)c0 | – |
| zyxel | px3321-t1_firmware | <= 5.44\(acjb.1.5\)c0 | – |
| zyxel | px5301-t0_firmware | <= 5.44\(ackb.0.6\)c0 | – |
| zyxel | scr_50axe_firmware | <= 1.30\(acgn.0\)c0 | – |
| zyxel | vmg8623-t50b_firmware | <= 5.50\(abpm.9.7\)c0 | – |
| zyxel | we3300-00_firmware | <= 5.70\(acka.1.1\)c0 | – |
| zyxel | wx3100-t0_firmware | <= 5.50\(abvl.4.9\)c0 | – |
| zyxel | wx3401-b1_firmware | <= 5.17\(abve.2.10\)c0 | – |
| zyxel | wx5600-t0_firmware | <= 5.70\(aceb.5.1\)c0 | – |
| zyxel | wx5610-b0_firmware | <= 5.18\(acgj.0.5\)c0 | – |
Original title
A null pointer dereference vulnerability in the certificate downloader CGI program of the Zyxel VMG3625-T50B firmware versions through 5.50(ABPM.9.6)C0 and the Zyxel WX3100-T0 firmware versions thr...
Original description
A null pointer dereference vulnerability in the certificate downloader CGI program of the Zyxel VMG3625-T50B firmware versions through 5.50(ABPM.9.6)C0 and the Zyxel WX3100-T0 firmware versions through 5.50(ABVL.4.8)C0 could allow an authenticated attacker with administrator privileges to trigger a denial-of-service (DoS) condition by sending a crafted HTTP request.
nvd CVSS3.1
4.9
Vulnerability type
CWE-476
NULL Pointer Dereference
Published: 24 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026