No exploitation reportedFix available

CVE-2021-33729

Q: Is CVE-2021-33729 actively exploited?

Active exploitation of CVE-2021-33729 has not been confirmed. Its EPSS score was 2.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-33729?

CVE-2021-33729 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2021-10-12
Fixed in1.0
WeaknessCWE-89

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 SINEC NMS (All versions < V1.0 SP2 Update 1). An authenticated attacker that is able to import firmware containers to an affected system could execute arbitrary commands in the local database.

Timeline

dates in UTC

2021-10-1210:15CVE 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-2021-33729?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-33729?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Siemens sinec nms

Branch	Affected	Fixed in	Source
1.0	< 1.0	1.0	NVD
1.0	= 1.0	no fix published	NVD

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-21-287-05 CISA1 known affected
Siemens SINEC NMS
SINEC NMS

Full record on NVD

Fix

Update Siemens sinec nms to 1.0
Vendor fix CISA ICSA-21-287-05 · 1 productUpdate to V1.0 SP2 Update 1 or later version
Mitigation from the vendor CISA ICSA-21-287-05 · 1 productRestrict 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 3.18.8read 2026-10-23
NVDCVSS 2.06.5read 2026-10-23
CNAweakness (CWE)CWE-89read 2026-10-23
FIRST EPSSEPSS score2.4 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2021-10-12
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-33729?

Is CVE-2021-33729 actively exploited?

Active exploitation of CVE-2021-33729 has not been confirmed. Its EPSS score was 2.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-33729?

CVE-2021-33729 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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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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