CVE-2018-9129
CVE-2018-9129 is a medium-severity vulnerability in Zyxel Zywall 110 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.
Key facts
- Severity: Medium (CVSS 3.x base score 5.9)
- CVSS v2: 4.3
- EPSS exploit prediction: 1% (57th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Zyxel Zywall 110 Firmware
- Published:
- Last modified:
Description
ZyXEL ZyWALL/USG series devices have a Bleichenbacher vulnerability in their Internet Key Exchange (IKE) handshake implementation used for IPsec based VPN connections.
Frequently asked questions
- What is CVE-2018-9129?
- ZyXEL ZyWALL/USG series devices have a Bleichenbacher vulnerability in their Internet Key Exchange (IKE) handshake implementation used for IPsec based VPN connections.
- How severe is CVE-2018-9129?
- CVE-2018-9129 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 none, integrity high, and availability none.
- Is CVE-2018-9129 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2018-9129?
- CVE-2018-9129 primarily affects Zyxel Zywall 110 Firmware. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2018-9129?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2018-9129 published?
- CVE-2018-9129 was published on 2018-08-15 and last updated on 2026-06-17.
References
- ftp://ftp.zyxel.com/USG110/firmware/USG110_4.32%28AAPH.0%29C0_2.pdf
- https://web-in-security.blogspot.com/2018/08/practical-bleichenbacher-attacks-on-ipsec-ike.html
- https://www.zyxel.com/support/bleichenbacher_attack_vulnerability.shtml
Affected products (17)
- cpe:2.3:o:zyxel:zywall_110_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zywall_1100_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zywall_310_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zywall_vpn_50_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zywall_vpn_100_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zywall_vpn_300_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_20w_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_40_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_40w_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_60_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_60w_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_110_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_2200-vpn_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_310_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_1100_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_1900_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_20w-vpn_firmware:-:*:*:*:*:*:*:*
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