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CVE-2021-26471

31
FAUCET Score

CVE-2021-26471 is a critical unauthenticated remote command injection vulnerability affecting Vembu BDR Suite and Vembu OffsiteDR versions prior to 4.2.0.1. An attacker can exploit a flaw in the /sgwebservice_o.php HTTP API by manipulating the 'command' argument to execute arbitrary shell commands. This vulnerability carries a CVSS score of 9.8 (CRITICAL) due to its network-based attack vector, low attack complexity, and complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation (KEV list) or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness and potential interest among security researchers.

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
2.26%
Probability of exploitation in next 30 days
EPSS Percentile
81.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0226 is in the 71st percentile among its peer group of 36,862 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-2021-26471
Third Party Advisory
wbsec.nl / vembu
Broken LinkThird Party Advisory