CVE-2023-5035: Cookie Without Secure Flag

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-11-02 · updated 2026-06-17
Weakness: CWE-614

Description

A vulnerability has been identified in PT-G503 Series firmware versions prior to v5.2, where the Secure attribute for sensitive cookies in HTTPS sessions is not set, which could cause the cookie to be transmitted in plaintext over an HTTP session. The vulnerability may lead to security risks, potentially exposing user session data to unauthorized access and manipulation.

Affected products

Moxa PT-G503 Series: before 5.2 — fixed in 5.2

How to fix

Upgrade to a fixed version: Moxa PT-G503 Series 5.2. Check the vendor advisory for mitigations.

References

https://www.moxa.com/en/support/product-support/security-advisory/mpsa-230203-pt-g503-series-multiple-vulnerabilities
https://www.moxa.com/en/support/product-support/security-advisory/mpsa-230203-pt-g503-series-multiple-vulnerabilities

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