CVE-2021-26471: In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1, the http API located at /sgwebservice_o.php acce

Q: How do I fix CVE-2021-26471?

bdr suite: upgrade to 4.2.0.1; offsite dr: upgrade to 4.2.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-26471 being exploited?

CVE-2021-26471 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-26471 affect?

CVE-2021-26471 affects bdr suite, offsite dr. Severity is critical (CVSS 9.8). In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1, the http API located at /sgwebservice_o.php accepts a command argument. Using this command argument an unauthenticated attacker can execute arbitrary shell commands.

Q: How urgent is CVE-2021-26471?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2021-26471 is a critical-severity flaw (CVSS 9.8) affecting bdr suite, offsite dr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1, the http API located at /sgwebservice_o.php accepts a command argument. Using this command argument an unauthenticated attacker can execute arbitrary shell commands.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Published	2021-06-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: vembu

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-06-08 19:15 UTCPublished CVE record published
2026-06-17 03:43 UTCUpdated Record last modified

vembu bdr suite UPGRADE

Affected: < 4.2.0.1

Fixed in: 4.2.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bdr-suite || rpm -q bdr-suite || bdr-suite --version

2. UPGRADE to 4.2.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bdr-suite

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bdr-suite

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

vembu offsite dr UPGRADE

Affected: < 4.2.0.1

Fixed in: 4.2.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy offsite-dr || rpm -q offsite-dr || offsite-dr --version

2. UPGRADE to 4.2.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade offsite-dr

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade offsite-dr

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-26471?

bdr suite: upgrade to 4.2.0.1; offsite dr: upgrade to 4.2.0.1. Exact commands for each OS are on this page.

Is CVE-2021-26471 being exploited?

CVE-2021-26471 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-26471 affect?

CVE-2021-26471 affects bdr suite, offsite dr. Severity is critical (CVSS 9.8). In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1, the http API located at /sgwebservice_o.php accepts a command argument. Using this command argument an unauthenticated attacker can execute arbitrary shell commands.

How urgent is CVE-2021-26471?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-43458 HIGH 7.8 DOWNGRADE An Unquoted Service Path vulnerability exits in Vembu BDR 4.2.0.1 via a specially crafted file in the (1) hsfl
CVE-2021-26474 HIGH 8.6 UPGRADE DOWNGRADE Various Vembu products allow an attacker to execute a (non-blind) http-only Cross Site Request Forgery (Other
CVE-2021-26473 CRITICAL 9.8 UPGRADE UPGRADE In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1 the http API located at /sgwebservice_o.php actio
CVE-2021-26472 CRITICAL 10.0 UPGRADE UPGRADE In VembuBDR before 4.2.0.1 and VembuOffsiteDR before 4.2.0.1 installed on Windows, the http API located at /co

References

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