CVE-2021-39271

Name: CVE-2021-39271
Creator: NVD / NIST
Published: 2021-08-30T05:15:07.307+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 3.68%

Last modified Jun 17, 2026

CVE-2021-39271 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 3.68% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.68%

88.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Bscw	Bscw Classic	< 5.0.12
Bscw	Bscw Classic	>= 5.1.0, < 5.1.10
Bscw	Bscw Classic	>= 5.2.0, < 5.2.4
Bscw	Bscw Classic	>= 7.3.0, < 7.3.3
Bscw	Bscw Classic	>= 7.4.0, < 7.4.3

References

http://packetstormsecurity.com/files/163989/BSCW-Server-Remote-Code-Execution.htmlExploit, Mailing List, Third Party Advisory
https://seclists.org/fulldisclosure/2021/Aug/24Exploit, Mailing List, Third Party Advisory
https://www.bscw.de/en/company/Vendor Advisory
http://packetstormsecurity.com/files/163989/BSCW-Server-Remote-Code-Execution.htmlExploit, Mailing List, Third Party Advisory
https://seclists.org/fulldisclosure/2021/Aug/24Exploit, Mailing List, Third Party Advisory
https://www.bscw.de/en/company/Vendor Advisory

Timeline

Published: Aug 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39271?

How severe is CVE-2021-39271?

CVE-2021-39271 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.68% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39271?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39271?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST