Skip to main content
No exploitation reportedFix available

CVE-2020-25241

No exploitation reported by the sources we read.

  • Published2021-03-15
  • Fixed in7.0.6
  • WeaknessCWE-1285 · CWE-129

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 SIMATIC MV400 family (All Versions < V7.0.6). The underlying TCP stack of the affected products does not correctly validate the sequence number for incoming TCP RST packages. An attacker could exploit this to terminate arbitrary TCP sessions.

Timeline

dates in UTC
  1. 2021-03-1517:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2020-25241?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-25241?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Siemens simatic mv420 sr-b body firmwareversion to verify
BranchAffectedFixed in
7.0< 7.0.67.0.6
Siemens simatic mv420 sr-b firmwareversion to verify
BranchAffectedFixed in
7.0< 7.0.67.0.6
Siemens simatic mv420 sr-p body firmwareversion to verify
BranchAffectedFixed in
7.0< 7.0.67.0.6

4 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-21-068-07 CISA1 known affected

    Siemens TCP Stack of SIMATIC MV400

    Siemens SIMATIC MV400 family: All Versions < V7.0.6

Full record on NVD

Fix

  1. Update Siemens simatic mv420 sr-b body firmware to 7.0.6
  2. Vendor fix CISA ICSA-21-068-07 · 1 productUpdate to V7.0.6

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • CNAweakness (CWE)CWE-1285read 2026-10-23
  • NVDweakness (CWE)CWE-129read 2026-10-23
  • FIRST EPSSEPSS score1.1 %2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-03-15
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2020-25241?

A vulnerability has been identified in SIMATIC MV400 family (All Versions < V7.0.6). The underlying TCP stack of the affected products does not correctly validate the sequence number for incoming TCP RST packages. An attacker could exploit this to terminate arbitrary TCP sessions.

Is CVE-2020-25241 actively exploited?

Active exploitation of CVE-2020-25241 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-25241?

CVE-2020-25241 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Running SIMATIC MV400 family (All? 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 ».

Get alerts for this productCISA KEV additions, October 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database