# Uncontrolled resource consumption in Siemens SIMATIC RF166C and others CVE record · `CVE-2021-31340` - **Identifiers:** `CVE-2021-31340` - **State:** Confirmed - **Severity:** No CVSS score - **Critical:** No - **CNA:** siemens - **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html) - **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md) - **Technologies:** [Siemens SIMATIC RF166C](https://agentprime.io/advisories/technology/siemens-simatic-rf166c.md) · [Siemens SIMATIC RF185C](https://agentprime.io/advisories/technology/siemens-simatic-rf185c.md) · [Siemens SIMATIC RF186C](https://agentprime.io/advisories/technology/siemens-simatic-rf186c.md) · [Siemens SIMATIC RF186CI](https://agentprime.io/advisories/technology/siemens-simatic-rf186ci.md) · [Siemens SIMATIC RF188C](https://agentprime.io/advisories/technology/siemens-simatic-rf188c.md) · [Siemens SIMATIC RF188CI](https://agentprime.io/advisories/technology/siemens-simatic-rf188ci.md) · [Siemens SIMATIC RF360R](https://agentprime.io/advisories/technology/siemens-simatic-rf360r.md) · [Siemens SIMATIC Reader RF610R CMIIT](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf610r-cmiit.md) · [Siemens SIMATIC Reader RF610R ETSI](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf610r-etsi.md) · [Siemens SIMATIC Reader RF610R FCC](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf610r-fcc.md) · [Siemens SIMATIC Reader RF615R CMIIT](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf615r-cmiit.md) · [Siemens SIMATIC Reader RF615R ETSI](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf615r-etsi.md) · [Siemens SIMATIC Reader RF615R FCC](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf615r-fcc.md) · [Siemens SIMATIC Reader RF650R ARIB](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf650r-arib.md) · [Siemens SIMATIC Reader RF650R CMIIT](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf650r-cmiit.md) · [Siemens SIMATIC Reader RF650R ETSI](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf650r-etsi.md) · [Siemens SIMATIC Reader RF650R FCC](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf650r-fcc.md) · [Siemens SIMATIC Reader RF680R ARIB](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf680r-arib.md) · [Siemens SIMATIC Reader RF680R CMIIT](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf680r-cmiit.md) · [Siemens SIMATIC Reader RF680R ETSI](https://agentprime.io/advisories/technology/siemens-simatic-reader-rf680r-etsi.md) - **Published:** 8 Jun 2021 - **Updated:** 3 Aug 2024 - **Reviewed by a person:** No Published by the CVE Program (CNA: siemens) at 8 Jun 2021, 19:47 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. ## Affected products, as the CNA wrote them - Vendor: Siemens. Product: SIMATIC RF166C. - affected: `All versions > V1.1 and < V1.3.2` - Vendor: Siemens. Product: SIMATIC RF185C. - affected: `All versions > V1.1 and < V1.3.2` - Vendor: Siemens. Product: SIMATIC RF186C. - affected: `All versions > V1.1 and < V1.3.2` - Vendor: Siemens. Product: SIMATIC RF186CI. - affected: `All versions > V1.1 and < V1.3.2` - Vendor: Siemens. Product: SIMATIC RF188C. - affected: `All versions > V1.1 and < V1.3.2` - Vendor: Siemens. Product: SIMATIC RF188CI. - affected: `All versions > V1.1 and < V1.3.2` - Vendor: Siemens. Product: SIMATIC RF360R. - affected: `All versions < V2.0` - Vendor: Siemens. Product: SIMATIC Reader RF610R CMIIT. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF610R ETSI. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF610R FCC. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF615R CMIIT. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF615R ETSI. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF615R FCC. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF650R ARIB. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF650R CMIIT. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF650R ETSI. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF650R FCC. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF680R ARIB. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF680R CMIIT. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF680R ETSI. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF680R FCC. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF685R ARIB. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF685R CMIIT. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF685R ETSI. - affected: `All versions > V3.0 < V4.0` - Vendor: Siemens. Product: SIMATIC Reader RF685R FCC. - affected: `All versions > V3.0 < V4.0` ## Not analysed yet We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter. ## Severity and exploitation No source has published a CVSS score for this record yet. - **CISA KEV:** Not listed. - **EPSS:** 0.0099, the 62nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline This record came from the full history of the CVE Program, published 8 Jun 2021. New records show when each source confirmed them. ## Sources - [CVE List: CVE-2021-31340](https://www.cve.org/CVERecord?id=CVE-2021-31340) - [NVD: CVE-2021-31340](https://nvd.nist.gov/vuln/detail/CVE-2021-31340) ### References from the CNA - Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description. ## Check whether this affects you This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run. - With the agentprime MCP server (), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: - As JSON: - Everything that needs attention now: --- The web page: . Everything for agents: .