How severe is CVE-2020-7781?

CVE-2020-7781 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-2020-7781 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-7781?

CVE-2020-7781 affects Connection-tester Project Connection-tester. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-7781?

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-2020-7781 published?

CVE-2020-7781 was published on 2020-12-16 and last updated on 2026-06-17.

CVE-2020-7781

CVE-2020-7781 is a critical-severity vulnerability in Connection-tester Project Connection-tester 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Connection-tester Project Connection-tester
Published: 2020-12-16
Last modified: 2026-06-17

Description

This affects the package connection-tester before 0.2.1. The injection point is located in line 15 in index.js. The following PoC demonstrates the vulnerability:

Frequently asked questions

What is CVE-2020-7781?: This affects the package connection-tester before 0.2.1. The injection point is located in line 15 in index.js. The following PoC demonstrates the vulnerability:
How severe is CVE-2020-7781?: CVE-2020-7781 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-2020-7781 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-7781?: CVE-2020-7781 affects Connection-tester Project Connection-tester. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-7781?: 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-2020-7781 published?: CVE-2020-7781 was published on 2020-12-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:connection-tester_project:connection-tester:*:*:*:*:*:node.js:*:*

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