CVE Explorer
CVE-2026-3870
A buffer overflow vulnerability in the UPnP AddPortMapping() command in Zyxel VMG4005-B50B firmware versions through 5.13(ABRL.5.4)C0 could allow an adjacent attacker to trigger a temporary denial-of-service (DoS) condition affecting the UPnP function of the affected device.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"VMG4005-B50B firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"<= 5.13(ABRL.5.4)C0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:0ba427f952eac23df2fa3873b3f323d8e31401056f879d2b9ef237abaf372e02 · sha256:310d297e6d5f7626… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:0ba427f952eac23df2fa3873b3f323d8e31401056f879d2b9ef237abaf372e02 · sha256:310d297e6d5f7626… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-120","description":"CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:0ba427f952eac23df2fa3873b3f323d8e31401056f879d2b9ef237abaf372e02 · sha256:310d297e6d5f7626… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"tags":["vendor-advisory"],"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerabilities-in-the-upnp-function-of-certain-4g-lte-5g-nr-cpe-and-dsl-ethernet-cpe-06-02-2026"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:0ba427f952eac23df2fa3873b3f323d8e31401056f879d2b9ef237abaf372e02 · sha256:310d297e6d5f7626… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.