Cookie Without Secure Flag

published 2023-11-02 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-57381

cvss: 3.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

moxa eds-g503_firmware 5.2

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-09-05)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

Moxa PT-G503 Series

Classification

Weakness

CWE-614 Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
CWE-319 Cleartext Transmission of Sensitive Information

References

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

Sources

CVE List CVE-2023-5035
NVD CVE-2023-5035

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Summary