How severe is CVE-2023-28807?

CVE-2023-28807 has a CVSS 3.x base score of 5.1, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2023-28807 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-28807?

CVE-2023-28807 affects Zscaler Secure Internet And Saas Access. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-28807?

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

Does CVE-2023-28807 have an EU (EUVD) identifier?

Yes. CVE-2023-28807 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-32442.

When was CVE-2023-28807 published?

CVE-2023-28807 was published on 2024-01-31 and last updated on 2026-06-17.

CVE-2023-28807

CVE-2023-28807 is a medium-severity vulnerability in Zscaler Secure Internet And Saas Access with a CVSS 3.x base score of 5.1. 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-295.

Key facts

Severity: Medium (CVSS 3.x base score 5.1)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-32442
Weakness: CWE-295
Affected product: Zscaler Secure Internet And Saas Access
Published: 2024-01-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2023-28807?: CVE-2023-28807 has a CVSS 3.x base score of 5.1, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2023-28807 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-28807?: CVE-2023-28807 affects Zscaler Secure Internet And Saas Access. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-28807?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-28807 have an EU (EUVD) identifier?: Yes. CVE-2023-28807 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-32442.
When was CVE-2023-28807 published?: CVE-2023-28807 was published on 2024-01-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:zscaler:secure_internet_and_saas_access:*:*:*:*:*:*:*:*

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