VulnerabilityModified
CVE-2023-28807
In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name Indication (SNI) enables attackers to evade network security controls by hiding their communications within legitimate traffic.
HIGH 7.5EPSS 0.34%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name Indication (SNI) enables attackers to evade network security controls by hiding their communications within legitimate traffic.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.34% probability · 28th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-295
- Affected
- zscaler/secure internet and saas access
- Source
- cve@zscaler.com
References
- https://help.zscaler.com/zia/configuring-advanced-settings#dns-optimizationProduct
- https://help.zscaler.com/zia/configuring-advanced-settings#domain-frontingProduct
- https://help.zscaler.com/zia/configuring-advanced-settings#dns-optimizationProduct
- https://help.zscaler.com/zia/configuring-advanced-settings#domain-frontingProduct
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.