How severe is CVE-2019-6503?

CVE-2019-6503 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-2019-6503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-6503?

CVE-2019-6503 affects Chatopera Cosin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-6503?

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-2019-6503 published?

CVE-2019-6503 was published on 2019-01-22 and last updated on 2026-06-17.

CVE-2019-6503

CVE-2019-6503 is a critical-severity vulnerability in Chatopera Cosin 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-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Chatopera Cosin
Published: 2019-01-22
Last modified: 2026-06-17

Description

There is a deserialization vulnerability in Chatopera cosin v3.10.0. An attacker can execute commands during server-side deserialization by uploading maliciously constructed files. This is related to the TemplateController.java impsave method and the MainUtils toObject method.

Frequently asked questions

What is CVE-2019-6503?: There is a deserialization vulnerability in Chatopera cosin v3.10.0. An attacker can execute commands during server-side deserialization by uploading maliciously constructed files. This is related to the TemplateController.java impsave method and the MainUtils toObject method.
How severe is CVE-2019-6503?: CVE-2019-6503 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-2019-6503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-6503?: CVE-2019-6503 affects Chatopera Cosin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-6503?: 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-2019-6503 published?: CVE-2019-6503 was published on 2019-01-22 and last updated on 2026-06-17.

References

https://github.com/chatopera/cosin/issues/177

Affected products (1)

cpe:2.3:a:chatopera:cosin:3.10.0:*:*:*:*:*:*:*

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