CVE-2020-25234
No exploitation reported by the sources we read.
- Published2020-12-14
- Fixed in8.3
- WeaknessCWE-321
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « 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 LOGO! 8 BM (incl. SIPLUS variants) (All versions < V8.3), LOGO! Soft Comfort (All versions < V8.3). The LOGO! program files generated and used by the affected components offer the possibility to save user-defined functions (UDF) in a password protected way. This protection is implemented in the software that displays the information. An attacker could reverse engineer the UDFs directly from stored program files.
Timeline
dates in UTC- 2020-12-1421:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-25234?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-25234?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.3 | < 8.3 | 8.3 | 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
Siemens LOGO! 8 BM
Siemens LOGO! 8 BM (incl.'SIPLUS variants): All versions < V8.3 · Siemens LOGO! Soft Comfort: All versions < V8.3
Fix
- Update Siemens logo\! 8 bm firmware to 8.3
- Vendor fix CISA ICSA-20-343-10 · 1 productUpdate to V8.3. Notice that in order to update, a new hardware version if required.
- Vendor fix CISA ICSA-20-343-10 · 1 productUpdate to V8.3
- Mitigation from the vendor CISA ICSA-20-343-10 · 2 productsApply Defense-in-Depth concept, including protection concept outlined in the system manual.
Advisories and patches
- cert-portal.siemens.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.17.7read 2026-10-23
- NVDCVSS 2.03.6read 2026-10-23
- CNAweakness (CWE)CWE-321read 2026-10-23
- FIRST EPSSEPSS score0.3 %2026-10-22
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Published
- 2020-12-14
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-25234?
Is CVE-2020-25234 actively exploited?
What is the CVSS score for CVE-2020-25234?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.