No exploitation reportedFix available

CVE-2021-31891

No exploitation reported by the sources we read.

Published2021-09-14
WeaknessCWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability has been identified in Desigo CC (All versions with OIS Extension Module), GMA-Manager (All versions with OIS running on Debian 9 or earlier), Operation Scheduler (All versions with OIS running on Debian 9 or earlier), Siveillance Control (All versions with OIS running on Debian 9 or earlier), Siveillance Control Pro (All versions). The affected application incorrectly neutralizes special elements in a specific HTTP GET request which could lead to command injection. An unauthenticated remote attacker could exploit this vulnerability to execute arbitrary code on the system with root privileges.

Timeline

dates in UTC

2021-09-1411:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-31891?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-31891?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Siemens desigo cc

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Siemens gma-managerversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Siemens operation schedulerversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-257-18 CISA5 known affected
Siemens Siveillance OIS
Desigo CC · GMA-Manager · Operation Scheduler · +2 more

Full record on NVD

Fix

Vendor fix CISA ICSA-21-257-18 · 3 productsUpdate the OIS to V2.5.3 or apply the patch
Vendor fix CISA ICSA-21-257-18 · 1 productUpdate the OIS to V2.5.3 or V2.6.1, or apply the patch
Vendor fix CISA ICSA-21-257-18 · 1 productUpdate the OIS to V2.5.3 or V2.6.0, or apply the patch
Mitigation from the vendor CISA ICSA-21-257-18 · 5 productsEnsure that the systems where Siveillance OIS is installed are only accessible by trusted personnel
Mitigation from the vendor CISA ICSA-21-257-18 · 5 productsRestrict access to the affected systems, especially to port 443/tcp, to trusted IP addresses only

Advisories and patches

cert-portal.siemens.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.110read 2026-10-23
NVDCVSS 2.010read 2026-10-23
CNAweakness (CWE)CWE-78read 2026-10-23
FIRST EPSSEPSS score3.8 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Published: 2021-09-14
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-31891?

Is CVE-2021-31891 actively exploited?

Active exploitation of CVE-2021-31891 has not been confirmed. Its EPSS score was 3.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-31891?

CVE-2021-31891 has a CVSS v3 base score of 10 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Running Desigo CC (All versions with? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

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