How severe is CVE-2018-5455?

CVE-2018-5455 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-5455 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-5455?

CVE-2018-5455 primarily affects Moxa Oncell G3110-hspa Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-5455?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-5455 published?

CVE-2018-5455 was published on 2018-03-05 and last updated on 2026-06-17.

CVE-2018-5455

CVE-2018-5455 is a critical-severity vulnerability in Moxa Oncell G3110-hspa Firmware with a CVSS 3.x base score of 9.8. 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-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Moxa Oncell G3110-hspa Firmware
Published: 2018-03-05
Last modified: 2026-06-17

Description

A Reliance on Cookies without Validation and Integrity Checking issue was discovered in Moxa OnCell G3100-HSPA Series version 1.4 Build 16062919 and prior. The application allows a cookie parameter to consist of only digits, allowing an attacker to perform a brute force attack bypassing authentication and gaining access to device functions.

Frequently asked questions

What is CVE-2018-5455?: A Reliance on Cookies without Validation and Integrity Checking issue was discovered in Moxa OnCell G3100-HSPA Series version 1.4 Build 16062919 and prior. The application allows a cookie parameter to consist of only digits, allowing an attacker to perform a brute force attack bypassing authentication and gaining access to device functions.
How severe is CVE-2018-5455?: CVE-2018-5455 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-5455 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-5455?: CVE-2018-5455 primarily affects Moxa Oncell G3110-hspa Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-5455?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-5455 published?: CVE-2018-5455 was published on 2018-03-05 and last updated on 2026-06-17.

References

https://ics-cert.us-cert.gov/advisories/ICSA-18-060-02

Affected products (4)

cpe:2.3:o:moxa:oncell_g3110-hspa_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:oncell_g3110-hspa-t_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:oncell_g3150-hspa_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:moxa:oncell_g3150-hspa-t_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Moxa Oncell G3110-hspa Firmware

CVE-2017-7915 — Critical (CVSS 9.8): An Improper Restriction of Excessive Authentication Attempts issue was discovered in Moxa OnCell G3110-HSPA Version 1.3…
CVE-2017-7913 — Critical (CVSS 9.8): A Plaintext Storage of a Password issue was discovered in Moxa OnCell G3110-HSPA Version 1.3 build 15082117 and…
CVE-2017-7917 — High (CVSS 8.8): A Cross-Site Request Forgery issue was discovered in Moxa OnCell G3110-HSPA Version 1.3 build 15082117 and previous…
CVE-2018-5453 — High (CVSS 7.5): An Improper Handling of Length Parameter Inconsistency issue was discovered in Moxa OnCell G3100-HSPA Series version…
CVE-2018-5449 — Medium (CVSS 6.5): A NULL Pointer Dereference issue was discovered in Moxa OnCell G3100-HSPA Series version 1.4 Build 16062919 and prior.…

All CVEs affecting Moxa Oncell G3110-hspa Firmware →

Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-59500 — Critical (CVSS 10.0): CWE-287: Improper Authentication
CVE-2024-27253 — Critical (CVSS 10.0): IBM DOORS Next 7.0.3 through 7.0.3 Interim Fix 018 could allow an authenticated user to bypass security logic to…
CVE-2026-56162 — Critical (CVSS 10.0): Improper authentication in Azure SQL Database allows an unauthorized attacker to elevate privileges over a network.
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Browse all CWE-287 (Improper Authentication) vulnerabilities →