CVE-2021-42338
CVE-2021-42338 is a critical-severity vulnerability in 4mosan Gcb Doctor 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: 10.0
- EPSS exploit prediction: 6% (92nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-287
- Affected product: 4mosan Gcb Doctor
- Published:
- Last modified:
Description
4MOSAn GCB Doctor’s login page has improper validation of Cookie, which allows an unauthenticated remote attacker to bypass authentication by code injection in cookie, and arbitrarily manipulate the system or interrupt services by upload and execution of arbitrary files.
Frequently asked questions
- What is CVE-2021-42338?
- 4MOSAn GCB Doctor’s login page has improper validation of Cookie, which allows an unauthenticated remote attacker to bypass authentication by code injection in cookie, and arbitrarily manipulate the system or interrupt services by upload and execution of arbitrary files.
- How severe is CVE-2021-42338?
- CVE-2021-42338 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-2021-42338 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-42338?
- CVE-2021-42338 affects 4mosan Gcb Doctor. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-42338?
- 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-2021-42338 published?
- CVE-2021-42338 was published on 2021-11-19 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:4mosan:gcb_doctor:*:*:*:*:*:*:*:*
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- CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
- CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…
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