How severe is CVE-2020-13863?

CVE-2020-13863 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2020-13863 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-13863?

CVE-2020-13863 affects Mitel Micollab. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-13863?

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

When was CVE-2020-13863 published?

CVE-2020-13863 was published on 2020-08-26 and last updated on 2026-06-17.

CVE-2020-13863

CVE-2020-13863 is a high-severity vulnerability in Mitel Micollab with a CVSS 3.x base score of 8.1. 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-74.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 5.5
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Mitel Micollab
Published: 2020-08-26
Last modified: 2026-06-17

Description

The SAS portal of Mitel MiCollab before 9.1.3 could allow an attacker to access user data by performing a header injection in HTTP responses, due to the improper handling of input parameters. A successful exploit could allow an attacker to access user information.

Frequently asked questions

What is CVE-2020-13863?: The SAS portal of Mitel MiCollab before 9.1.3 could allow an attacker to access user data by performing a header injection in HTTP responses, due to the improper handling of input parameters. A successful exploit could allow an attacker to access user information.
How severe is CVE-2020-13863?: CVE-2020-13863 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2020-13863 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-13863?: CVE-2020-13863 affects Mitel Micollab. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-13863?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-13863 published?: CVE-2020-13863 was published on 2020-08-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mitel:micollab:*:*:*:*:*:-:*:*

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