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CVE-2021-26473

30
FAUCET Score

CVE-2021-26473 is a critical arbitrary file write vulnerability affecting VembuBDR and VembuOffsiteDR versions prior to 4.2.0.1. An unauthenticated attacker can exploit a flaw in the /sgwebservice_o.php API to upload and execute malicious files on the web server. With a CVSS score of 9.8, this vulnerability allows for complete compromise of confidentiality, integrity, and availability. While there is no known active exploitation or public exploit code, the high community discussion indicates significant awareness.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.2.0.1CPE matchmatch criteria
cpe:2.3:a:vembu:bdr_suite:*:*:*:*:*:*:*:*
< 4.2.0.1CPE matchmatch criteria
cpe:2.3:a:vembu:offsite_dr:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.76%
Probability of exploitation in next 30 days
EPSS Percentile
75.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0176 is in the 64th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

csirt.divd.nl / 2021/05/11/Vembu-zero-days
Third Party Advisory
csirt.divd.nl / cases/DIVD-2020-00011
Third Party Advisory
csirt.divd.nl / cves/CVE-2021-26473
Third Party Advisory
wbsec.nl / vembu
Broken LinkThird Party Advisory