How severe is CVE-2021-20874?

CVE-2021-20874 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-20874 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20874?

CVE-2021-20874 primarily affects Groupsession. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-20874?

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-2021-20874 published?

CVE-2021-20874 was published on 2021-12-24 and last updated on 2026-06-17.

CVE-2021-20874

CVE-2021-20874 is a high-severity vulnerability in Groupsession with a CVSS 3.x base score of 7.5. 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-732.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Affected product: Groupsession
Published: 2021-12-24
Last modified: 2026-06-17

Description

Incorrect permission assignment for critical resource vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier allows a remote unauthenticated attacker to access arbitrary files on the server and obtain sensitive information via unspecified vectors.

Frequently asked questions

What is CVE-2021-20874?: Incorrect permission assignment for critical resource vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier allows a remote unauthenticated attacker to access arbitrary files on the server and obtain sensitive information via unspecified vectors.
How severe is CVE-2021-20874?: CVE-2021-20874 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-20874 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20874?: CVE-2021-20874 primarily affects Groupsession. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-20874?: 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-2021-20874 published?: CVE-2021-20874 was published on 2021-12-24 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:groupsession:groupsession:*:*:*:*:cloud:*:*:*
cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:*
cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:*

More vulnerabilities in Groupsession

CVE-2021-20876 — Medium (CVSS 6.8): Path traversal vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and…
CVE-2017-2165 — Medium (CVSS 6.5): GroupSession versions 4.6.4 and earlier allows remote authenticated attackers to bypass access restrictions to obtain…
CVE-2025-65120 — Medium (CVSS 6.1): Reflected cross-site scripting vulnerability exists in GroupSession Free edition prior to ver5.7.1, GroupSession…
CVE-2025-57883 — Medium (CVSS 6.1): Reflected cross-site scripting vulnerability exists in GroupSession Free edition prior to ver5.3.0, GroupSession…
CVE-2025-54407 — Medium (CVSS 6.1): Stored cross-site scripting vulnerability exists in GroupSession Free edition prior to ver5.3.0, GroupSession byCloud…
CVE-2021-20875 — Medium (CVSS 6.1): Open redirect vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and…

All CVEs affecting Groupsession →

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