How severe is CVE-2015-7256?

CVE-2015-7256 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2015-7256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-7256?

CVE-2015-7256 primarily affects Zyxel Nwa1100-n Firmware. In total, 25 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-7256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-7256 published?

CVE-2015-7256 was published on 2017-09-28 and last updated on 2026-06-17.

CVE-2015-7256

CVE-2015-7256 is a medium-severity vulnerability in Zyxel Nwa1100-n Firmware with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Zyxel Nwa1100-n Firmware
Published: 2017-09-28
Last modified: 2026-06-17

Description

ZyXEL NWA1100-N, NWA1100-NH, NWA1121-NI, NWA1123-AC, and NWA1123-NI access points; P-660HN-51, P-663HN-51, VMG1312-B10A, VMG1312-B30A, VMG1312-B30B, VMG4380-B10A, VMG8324-B10A, VMG8924-B10A, VMG8924-B30A, and VSG1435-B101 DSL CPEs; PMG5318-B20A GPONs; SBG3300-N000, SBG3300-NB00, and SBG3500-N000 small business gateways; GS1900-8 and GS1900-24 switches; and C1000Z, Q1000, FR1000Z, and P8702N project models use non-unique X.509 certificates and SSH host keys.

Frequently asked questions

What is CVE-2015-7256?: ZyXEL NWA1100-N, NWA1100-NH, NWA1121-NI, NWA1123-AC, and NWA1123-NI access points; P-660HN-51, P-663HN-51, VMG1312-B10A, VMG1312-B30A, VMG1312-B30B, VMG4380-B10A, VMG8324-B10A, VMG8924-B10A, VMG8924-B30A, and VSG1435-B101 DSL CPEs; PMG5318-B20A GPONs; SBG3300-N000, SBG3300-NB00, and SBG3500-N000 small business gateways; GS1900-8 and GS1900-24 switches; and C1000Z, Q1000, FR1000Z, and P8702N project models use non-unique X.509 certificates and SSH host keys.
How severe is CVE-2015-7256?: CVE-2015-7256 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2015-7256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-7256?: CVE-2015-7256 primarily affects Zyxel Nwa1100-n Firmware. In total, 25 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-7256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-7256 published?: CVE-2015-7256 was published on 2017-09-28 and last updated on 2026-06-17.

References

Affected products (25)

cpe:2.3:o:zyxel:nwa1100-n_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa1100-nh_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa1121-ni_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa1123-ac_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nwa1123-ni_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:p-660hn-51_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:p-663hn-51_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg1312-b10a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg1312-b30a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg1312-b30b_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg4380-b10a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8324-b10a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8924-b10a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8924-b30a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vsg1435-b101_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:pmg5318-b20a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:sbg3300-n000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:sbg3300-nb00_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:sbg3500-n000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:gs1900-8_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:gs1900-24_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:c1000z_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:q1000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:fr1000z_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:p8702n_firmware:-:*:*:*:*:*:*:*

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