CVE-2021-44693 json
Affected devices don't process correctly certain special crafted packets sent to port 102/tcp, which could allow an attacker to cause a den…
published 2022-12-13 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-31509
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 55%
- public exploits
- 0
- none known
Summary
Affected devices don't process correctly certain special crafted packets sent to port 102/tcp, which could allow an attacker to cause a denial of service in the device.
Patch / fix
- siemens simatic_s7-plcsim_advanced_firmware 5.0
- siemens simatic_s7-1200_cpu_1211c_firmware 4.6.0
- siemens simatic_s7-1200_cpu_1212c_firmware 4.6.0
- siemens simatic_s7-1200_cpu_1212fc_firmware 4.6.0
- siemens simatic_s7-1200_cpu_1214_fc_firmware 4.6.0
- siemens simatic_s7-1200_cpu_1214c_firmware 4.6.0
- siemens simatic_s7-1200_cpu_1214fc_firmware 4.6.0
- siemens simatic_s7-1200_cpu_1215_fc_firmware 4.6.0
- siemens simatic_s7-1200_cpu_1215c_firmware 4.6.0
- siemens simatic_s7-1200_cpu_1215fc_firmware 4.6.0
- siemens simatic_s7-1200_cpu_1217c_firmware 4.6.0
- siemens simatic_s7-1200_cpu_12_1211c_firmware 4.6.0
- siemens simatic_s7-1200_cpu_12_1212c_firmware 4.6.0
- siemens simatic_s7-1200_cpu_12_1212fc_firmware 4.6.0
- siemens simatic_s7-1200_cpu_12_1214c_firmware 4.6.0
- siemens simatic_s7-1200_cpu_12_1214fc_firmware 4.6.0
- siemens simatic_s7-1200_cpu_12_1215c_firmware 4.6.0
- siemens simatic_s7-1200_cpu_12_1215fc_firmware 4.6.0
- siemens simatic_s7-1200_cpu_12_1217c_firmware 4.6.0
- siemens siplus_s7-1200_cp_1243-1_rail_firmware 4.6.0
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
cisa ICSA-22-349-03 updated cvss 4.9
Siemens Multiple Denial of Service Vulnerabilities in Industrial Products
-
Siemens SIMATIC Drive Controller CPU 1504D TF (6ES7615-4DF10-0AB0) <V2.9.7 Siemens SIMATIC Drive Controller CPU 1507D TF (6ES7615-7DF10-0AB0) <V2.9.7affected: fixed in V2.9.7, mitigation support.industry.siemens.com
-
Siemens SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) <V21.9.7affected: fixed in V21.9.7, mitigation support.industry.siemens.com
-
Siemens SIMATIC S7-1200 CPU family (incl. SIPLUS variants) <V4.6.0affected: fixed in V4.6.0, mitigation support.industry.siemens.com
-
Siemens SIMATIC S7-1500 CPU 1510SP F-1 PN (6ES7510-1SJ01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1510SP-1 PN (6ES7510-1DJ01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1511-1 PN (6ES7511-1AK01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1511-1 PN (6ES7511-1AK02-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1511C-1 PN (6ES7511-1CK00-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1511C-1 PN (6ES7511-1CK01-0AB0) <V2.9.7affected: fixed in V2.9.7, mitigation support.industry.siemens.com
+24 more productsfewer
Siemens SIMATIC S7-1500 CPU 1511F-1 PN (6ES7511-1FK01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1511F-1 PN (6ES7511-1FK02-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1511T-1 PN (6ES7511-1TK01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1511TF-1 PN (6ES7511-1UK01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1512C-1 PN (6ES7512-1CK00-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1512C-1 PN (6ES7512-1CK01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1512SP F-1 PN (6ES7512-1SK01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1512SP-1 PN (6ES7512-1DK01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1513-1 PN (6ES7513-1AL01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1513-1 PN (6ES7513-1AL02-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1513F-1 PN (6ES7513-1FL01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1513F-1 PN (6ES7513-1FL02-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1513R-1 PN (6ES7513-1RL00-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1515-2 PN (6ES7515-2AM01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1515-2 PN (6ES7515-2AM02-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1515F-2 PN (6ES7515-2FM01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1515F-2 PN (6ES7515-2FM02-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1515R-2 PN (6ES7515-2RM00-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1515T-2 PN (6ES7515-2TM01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1515TF-2 PN (6ES7515-2UM01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1516-3 PN/DP (6ES7516-3AN01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1516-3 PN/DP (6ES7516-3AN02-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1516F-3 PN/DP (6ES7516-3FN01-0AB0) <V2.9.7 Siemens SIMATIC S7-1500 CPU 1516F-3 PN/DP (6ES7516-3FN02-0AB0) <V2.9.7 -
Siemens SIMATIC S7-1500 CPU 1516T-3 PN/DP (6ES7516-3TN00-0AB0) <V3.0.1 Siemens SIMATIC S7-1500 CPU 1516TF-3 PN/DP (6ES7516-3UN00-0AB0) <V3.0.1 Siemens SIMATIC S7-1500 CPU 1517-3 PN/DP (6ES7517-3AP00-0AB0) <V3.0.1 Siemens SIMATIC S7-1500 CPU 1517F-3 PN/DP (6ES7517-3FP00-0AB0) <V3.0.1 Siemens SIMATIC S7-1500 CPU 1517H-3 PN (6ES7517-3HP00-0AB0) <V3.0.1 Siemens SIMATIC S7-1500 CPU 1517T-3 PN/DP (6ES7517-3TP00-0AB0) <V3.0.1affected: fixed in V3.0.1, mitigation support.industry.siemens.com
69 more affected in the full advisory
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 18 mo ago
Exploit prediction
0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C |
| CNA | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
- Siemens SIMATIC Drive Controller CPU 1504D TF
- Siemens SIMATIC Drive Controller CPU 1507D TF
- Siemens SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants)
- Siemens SIMATIC S7-1200 CPU family (incl. SIPLUS variants)
- Siemens SIMATIC S7-1500 CPU 1510SP F-1 PN
- Siemens SIMATIC S7-1500 CPU 1510SP-1 PN
- Siemens SIMATIC S7-1500 CPU 1511-1 PN
- Siemens SIMATIC S7-1500 CPU 1511C-1 PN
- Siemens SIMATIC S7-1500 CPU 1511F-1 PN
- Siemens SIMATIC S7-1500 CPU 1511T-1 PN
- Siemens SIMATIC S7-1500 CPU 1511TF-1 PN
- Siemens SIMATIC S7-1500 CPU 1512C-1 PN
- Siemens SIMATIC S7-1500 CPU 1512SP F-1 PN
- Siemens SIMATIC S7-1500 CPU 1512SP-1 PN
- Siemens SIMATIC S7-1500 CPU 1513-1 PN
- Siemens SIMATIC S7-1500 CPU 1513F-1 PN
- Siemens SIMATIC S7-1500 CPU 1513R-1 PN
- Siemens SIMATIC S7-1500 CPU 1515-2 PN
- Siemens SIMATIC S7-1500 CPU 1515F-2 PN
- Siemens SIMATIC S7-1500 CPU 1515R-2 PN
- Siemens SIMATIC S7-1500 CPU 1515T-2 PN
- Siemens SIMATIC S7-1500 CPU 1515TF-2 PN
- Siemens SIMATIC S7-1500 CPU 1516-3 PN/DP
- Siemens SIMATIC S7-1500 CPU 1516F-3 PN/DP
- Siemens SIMATIC S7-1500 CPU 1516T-3 PN/DP
- Siemens SIMATIC S7-1500 CPU 1516TF-3 PN/DP
- Siemens SIMATIC S7-1500 CPU 1517-3 PN/DP
- Siemens SIMATIC S7-1500 CPU 1517F-3 PN/DP
- Siemens SIMATIC S7-1500 CPU 1517H-3 PN
- Siemens SIMATIC S7-1500 CPU 1517T-3 PN/DP
- Siemens SIMATIC S7-1500 CPU 1517TF-3 PN/DP
- Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP
- Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
- Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP
- Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
- Siemens SIMATIC S7-1500 CPU 1518HF-4 PN
- Siemens SIMATIC S7-1500 CPU 1518T-4 PN/DP
- Siemens SIMATIC S7-1500 CPU 1518TF-4 PN/DP
- Siemens SIMATIC S7-1500 CPU S7-1518-4 PN/DP ODK
- Siemens SIMATIC S7-1500 CPU S7-1518F-4 PN/DP ODK
- Siemens SIMATIC S7-1500 ET 200pro: CPU 1513PRO F-2 PN
- Siemens SIMATIC S7-1500 ET 200pro: CPU 1513PRO-2 PN
- Siemens SIMATIC S7-1500 ET 200pro: CPU 1516PRO F-2 PN
- Siemens SIMATIC S7-1500 ET 200pro: CPU 1516PRO-2 PN
- Siemens SIMATIC S7-1500 Software Controller V2
- Siemens SIMATIC S7-PLCSIM Advanced
- Siemens SIPLUS ET 200SP CPU 1510SP F-1 PN
- Siemens SIPLUS ET 200SP CPU 1510SP F-1 PN RAIL
- Siemens SIPLUS ET 200SP CPU 1510SP-1 PN
- Siemens SIPLUS ET 200SP CPU 1510SP-1 PN RAIL
Classification
- Weakness
-
- CWE-1284 Improper Validation of Specified Quantity in Input
References
-
cert-portal.siemens.com
/productcert/pdf/ssa-382653.pdf
patch, vendor-advisory
Sources
- CVE List CVE-2021-44693
- NVD CVE-2021-44693
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.