CVE-2021-26473

Name: CVE-2021-26473
Creator: NVD / NIST
Published: 2021-06-08T19:15:08.29+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.76%

Last modified Jun 17, 2026

CVE-2021-26473 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1 the http API located at /sgwebservice_o.php action logFilePath allows an attacker to write arbitrary files in the context of the web server process. These files can then be executed remotely by calling the file via the web server.. EPSS estimates a 1.76% chance of exploitation in the next 30 days.

Description

In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1 the http API located at /sgwebservice_o.php action logFilePath allows an attacker to write arbitrary files in the context of the web server process. These files can then be executed remotely by calling the file via the web server.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.76%

75.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Vembu	Bdr Suite	< 4.2.0.1
Vembu	Offsite Dr	< 4.2.0.1

References

https://csirt.divd.nl/2021/05/11/Vembu-zero-days/Third Party Advisory
https://csirt.divd.nl/cases/DIVD-2020-00011/Third Party Advisory
https://csirt.divd.nl/cves/CVE-2021-26473/Third Party Advisory
https://www.wbsec.nl/vembuBroken Link, Third Party Advisory
https://csirt.divd.nl/2021/05/11/Vembu-zero-days/Third Party Advisory
https://csirt.divd.nl/cases/DIVD-2020-00011/Third Party Advisory
https://csirt.divd.nl/cves/CVE-2021-26473/Third Party Advisory
https://www.wbsec.nl/vembuBroken Link, Third Party Advisory

Timeline

Published: Jun 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26473?

How severe is CVE-2021-26473?

CVE-2021-26473 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.76% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26473?

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-2021-26473?

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

Scan your code now

Source: NVD / NIST