How severe is CVE-2021-27402?

CVE-2021-27402 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-27402 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27402?

CVE-2021-27402 primarily affects Mitel Micollab. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-27402?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-27402 published?

CVE-2021-27402 was published on 2021-08-13 and last updated on 2026-06-17.

CVE-2021-27402

CVE-2021-27402 is a medium-severity vulnerability in Mitel Micollab with a CVSS 3.x base score of 6.5. 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-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.4
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Mitel Micollab
Published: 2021-08-13
Last modified: 2026-06-17

Description

The SAS Admin portal of Mitel MiCollab before 9.2 FP2 could allow an unauthenticated attacker to access (view and modify) user data by injecting arbitrary directory paths due to improper URL validation, aka Directory Traversal.

Frequently asked questions

What is CVE-2021-27402?: The SAS Admin portal of Mitel MiCollab before 9.2 FP2 could allow an unauthenticated attacker to access (view and modify) user data by injecting arbitrary directory paths due to improper URL validation, aka Directory Traversal.
How severe is CVE-2021-27402?: CVE-2021-27402 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-27402 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27402?: CVE-2021-27402 primarily affects Mitel Micollab. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-27402?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27402 published?: CVE-2021-27402 was published on 2021-08-13 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:mitel:micollab:*:*:*:*:*:-:*:*
cpe:2.3:a:mitel:micollab:9.2:-:*:*:*:-:*:*
cpe:2.3:a:mitel:micollab:9.2:fp1:*:*:*:-:*:*

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CVE-2022-36452 — Critical (CVSS 9.8): A vulnerability in the web conferencing component of Mitel MiCollab through 9.5.0.101 could allow an unauthenticated…
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