CVE-2021-31340A vulnerability has been identified in SIMATIC RF166C (All versions > V1.1 and < V1.3.2), SIMATIC RF185C (All versions > V1.1 and <…
- 7.5HighCVSS base score
- 0.99%Exploitation in 30 daysEPSS · top 37% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability has been identified in SIMATIC RF166C (All versions > V1.1 and < V1.3.2), SIMATIC RF185C (All versions > V1.1 and < V1.3.2), SIMATIC RF186C (All versions > V1.1 and < V1.3.2), SIMATIC RF186CI (All versions > V1.1 and < V1.3.2), SIMATIC RF188C (All versions > V1.1 and < V1.3.2), SIMATIC RF188CI (All versions > V1.1 and < V1.3.2), SIMATIC RF360R (All versions < V2.0), SIMATIC Reader RF610R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF610R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF610R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF615R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF615R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF615R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF650R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF650R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF650R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF650R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF680R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF680R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF680R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF680R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF685R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF685R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF685R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF685R FCC (All versions > V3.0 < V4.0). Affected devices do not properly handle large numbers of incoming connections. An attacker may leverage this to cause a Denial-of-Service situation.
Timeline
ID reserved
By siemens
- 54 days later
· 54 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.99% · top 37% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected All versions > V1.1 and < V1.3.2
- affected All versions > V1.1 and < V1.3.2
- affected All versions > V1.1 and < V1.3.2
- affected All versions > V1.1 and < V1.3.2
- affected All versions > V1.1 and < V1.3.2
- affected All versions > V1.1 and < V1.3.2
- affected All versions < V2.0
Siemens · SIMATIC Reader RF610R CMIIT
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF610R ETSI
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF610R FCC
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF615R CMIIT
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF615R ETSI
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF615R FCC
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF650R ARIB
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF650R CMIIT
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF650R ETSI
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF650R FCC
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF680R ARIB
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF680R CMIIT
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF680R ETSI
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF680R FCC
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF685R ARIB
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF685R CMIIT
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF685R ETSI
- affected All versions > V3.0 < V4.0
Siemens · SIMATIC Reader RF685R FCC
- affected All versions > V3.0 < V4.0
References
References1
- https://cert-portal.siemens.com/productcert/pdf/ssa-787292.pdf (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-18250 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-31340)Record last updated .