How severe is CVE-2021-39271?

CVE-2021-39271 has a CVSS 3.x base score of 8.8, 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 high, and availability high.

Is CVE-2021-39271 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39271?

CVE-2021-39271 affects Bscw Bscw Classic. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39271?

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-2021-39271 published?

CVE-2021-39271 was published on 2021-08-30 and last updated on 2026-06-17.

CVE-2021-39271

CVE-2021-39271 is a high-severity vulnerability in Bscw Bscw Classic with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Bscw Bscw Classic
Published: 2021-08-30
Last modified: 2026-06-17

Description

OrbiTeam BSCW Classic before 7.4.3 allows authenticated remote code execution (RCE) during archive extraction via attacker-supplied Python code in the class attribute of a .bscw file. This is fixed in 5.0.12, 5.1.10, 5.2.4, 7.3.3, and 7.4.3.

Frequently asked questions

What is CVE-2021-39271?: OrbiTeam BSCW Classic before 7.4.3 allows authenticated remote code execution (RCE) during archive extraction via attacker-supplied Python code in the class attribute of a .bscw file. This is fixed in 5.0.12, 5.1.10, 5.2.4, 7.3.3, and 7.4.3.
How severe is CVE-2021-39271?: CVE-2021-39271 has a CVSS 3.x base score of 8.8, 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 high, and availability high.
Is CVE-2021-39271 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39271?: CVE-2021-39271 affects Bscw Bscw Classic. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39271?: 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-2021-39271 published?: CVE-2021-39271 was published on 2021-08-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bscw:bscw_classic:*:*:*:*:*:*:*:*

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