How severe is CVE-2020-6637?

CVE-2020-6637 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-2020-6637 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-6637?

CVE-2020-6637 affects Os4ed Opensis. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-6637?

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-2020-6637 published?

CVE-2020-6637 was published on 2020-08-24 and last updated on 2026-06-17.

CVE-2020-6637

CVE-2020-6637 is a critical-severity vulnerability in Os4ed Opensis with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 20% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 20% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Os4ed Opensis
Published: 2020-08-24
Last modified: 2026-06-17

Description

openSIS Community Edition version 7.3 is vulnerable to SQL injection via the USERNAME parameter of index.php.

Frequently asked questions

What is CVE-2020-6637?: openSIS Community Edition version 7.3 is vulnerable to SQL injection via the USERNAME parameter of index.php.
How severe is CVE-2020-6637?: CVE-2020-6637 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-2020-6637 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-6637?: CVE-2020-6637 affects Os4ed Opensis. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-6637?: 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-2020-6637 published?: CVE-2020-6637 was published on 2020-08-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:os4ed:opensis:7.3:*:*:*:community:*:*:*

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