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ID

VAR-202109-1919


CVE

CVE-2021-33720


TITLE

Classic buffer overflow vulnerability in multiple Siemens products

Trust: 0.8

sources: JVNDB: JVNDB-2021-012335

DESCRIPTION

A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions < V8.80), SIPROTEC 5 relays with CPU variants CP100 (All versions < V8.80), SIPROTEC 5 relays with CPU variants CP300 (All versions < V8.80). Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition. Siemens SIPROTEC 5 is a multifunctional relay manufactured by Siemens, Germany. Siemens SIPROTEC 5 relays has a buffer overflow vulnerability. Attackers can use the vulnerability to send constructed data packets to port 4443/TCP, resulting in a denial of service. Pillow is a Python-based image processing library. There is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements

Trust: 2.79

sources: NVD: CVE-2021-33720 // JVNDB: JVNDB-2021-012335 // CNVD: CNVD-2021-71445 // CNNVD: CNNVD-202104-975 // VULMON: CVE-2021-33720

IOT TAXONOMY

category:['ICS']sub_category: -

Trust: 0.6

sources: CNVD: CNVD-2021-71445

AFFECTED PRODUCTS

vendor:siemensmodel:siprotec 5 with cpu variant cp100scope:ltversion:8.80

Trust: 1.0

vendor:siemensmodel:siprotec 5 with cpu variant cp050scope:ltversion:8.80

Trust: 1.0

vendor:siemensmodel:siprotec 5 with cpu variant cp300scope:ltversion:8.80

Trust: 1.0

vendor:シーメンスmodel:siprotec 5 relays with cpu variants cp050scope: - version: -

Trust: 0.8

vendor:シーメンスmodel:siprotec 5 relays with cpu variants cp100scope: - version: -

Trust: 0.8

vendor:シーメンスmodel:siprotec 5 relays with cpu variants cp300scope:eqversion:8.80

Trust: 0.8

vendor:siemensmodel:siprotec relays with cpu variants cp300scope:eqversion:5<v8.80

Trust: 0.6

vendor:siemensmodel:siprotec relays with cpu variants cp200scope:eqversion:5

Trust: 0.6

vendor:siemensmodel:siprotec relays with cpu variants cp100scope:eqversion:5<v8.80

Trust: 0.6

vendor:siemensmodel:siprotec relays with cpu variants cp050scope:eqversion:5<v8.80

Trust: 0.6

sources: CNVD: CNVD-2021-71445 // JVNDB: JVNDB-2021-012335 // NVD: CVE-2021-33720

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov: CVE-2021-33720
value: HIGH

Trust: 1.0

NVD: CVE-2021-33720
value: HIGH

Trust: 0.8

CNVD: CNVD-2021-71445
value: MEDIUM

Trust: 0.6

CNNVD: CNNVD-202104-975
value: MEDIUM

Trust: 0.6

CNNVD: CNNVD-202109-956
value: HIGH

Trust: 0.6

VULMON: CVE-2021-33720
value: MEDIUM

Trust: 0.1

nvd@nist.gov: CVE-2021-33720
severity: MEDIUM
baseScore: 5.0
vectorString: AV:N/AC:L/AU:N/C:N/I:N/A:P
accessVector: NETWORK
accessComplexity: LOW
authentication: NONE
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: PARTIAL
exploitabilityScore: 10.0
impactScore: 2.9
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 1.9

CNVD: CNVD-2021-71445
severity: MEDIUM
baseScore: 5.0
vectorString: AV:N/AC:L/AU:N/C:N/I:N/A:P
accessVector: NETWORK
accessComplexity: LOW
authentication: NONE
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: PARTIAL
exploitabilityScore: 10.0
impactScore: 2.9
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 0.6

nvd@nist.gov: CVE-2021-33720
baseSeverity: HIGH
baseScore: 7.5
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
exploitabilityScore: 3.9
impactScore: 3.6
version: 3.1

Trust: 1.0

NVD: CVE-2021-33720
baseSeverity: HIGH
baseScore: 7.5
vectorString: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
exploitabilityScore: NONE
impactScore: NONE
version: 3.0

Trust: 0.8

sources: CNVD: CNVD-2021-71445 // VULMON: CVE-2021-33720 // JVNDB: JVNDB-2021-012335 // CNNVD: CNNVD-202104-975 // CNNVD: CNNVD-202109-956 // NVD: CVE-2021-33720

PROBLEMTYPE DATA

problemtype:CWE-120

Trust: 1.0

problemtype:Classic buffer overflow (CWE-120) [NVD evaluation ]

Trust: 0.8

sources: JVNDB: JVNDB-2021-012335 // NVD: CVE-2021-33720

THREAT TYPE

remote

Trust: 0.6

sources: CNNVD: CNNVD-202109-956

TYPE

other

Trust: 0.6

sources: CNNVD: CNNVD-202104-975

PATCH

title:SSA-847986url:https://cert-portal.siemens.com/productcert/pdf/ssa-847986.pdf

Trust: 0.8

title:Patch for Siemens SIPROTEC 5 relays buffer overflow vulnerability (CNVD-2021-71445)url:https://www.cnvd.org.cn/patchInfo/show/291046

Trust: 0.6

title:Siemens SIPROTEC 5 Fixes for code injection vulnerabilitiesurl:http://www.cnnvd.org.cn/web/xxk/bdxqById.tag?id=164126

Trust: 0.6

sources: CNVD: CNVD-2021-71445 // JVNDB: JVNDB-2021-012335 // CNNVD: CNNVD-202109-956

EXTERNAL IDS

db:NVDid:CVE-2021-33720

Trust: 3.9

db:SIEMENSid:SSA-847986

Trust: 2.3

db:ICS CERTid:ICSA-21-257-10

Trust: 1.4

db:JVNid:JVNVU96712416

Trust: 0.8

db:JVNDBid:JVNDB-2021-012335

Trust: 0.8

db:CNVDid:CNVD-2021-71445

Trust: 0.6

db:CS-HELPid:SB2021041363

Trust: 0.6

db:CNNVDid:CNNVD-202104-975

Trust: 0.6

db:CS-HELPid:SB2021091518

Trust: 0.6

db:AUSCERTid:ESB-2021.3110

Trust: 0.6

db:CNNVDid:CNNVD-202109-956

Trust: 0.6

db:VULMONid:CVE-2021-33720

Trust: 0.1

sources: CNVD: CNVD-2021-71445 // VULMON: CVE-2021-33720 // JVNDB: JVNDB-2021-012335 // CNNVD: CNNVD-202104-975 // CNNVD: CNNVD-202109-956 // NVD: CVE-2021-33720

REFERENCES

url:https://cert-portal.siemens.com/productcert/pdf/ssa-847986.pdf

Trust: 2.3

url:https://nvd.nist.gov/vuln/detail/cve-2021-33720

Trust: 1.4

url:https://jvn.jp/vu/jvnvu96712416/

Trust: 0.8

url:https://www.cisa.gov/uscert/ics/advisories/icsa-21-257-10

Trust: 0.8

url:https://www.cybersecurity-help.cz/vdb/sb2021041363

Trust: 0.6

url:https://us-cert.cisa.gov/ics/advisories/icsa-21-257-10

Trust: 0.6

url:https://www.auscert.org.au/bulletins/esb-2021.3110

Trust: 0.6

url:https://www.cybersecurity-help.cz/vdb/sb2021091518

Trust: 0.6

url:https://cwe.mitre.org/data/definitions/120.html

Trust: 0.1

url:https://nvd.nist.gov

Trust: 0.1

sources: CNVD: CNVD-2021-71445 // VULMON: CVE-2021-33720 // JVNDB: JVNDB-2021-012335 // CNNVD: CNNVD-202104-975 // CNNVD: CNNVD-202109-956 // NVD: CVE-2021-33720

CREDITS

Michael Messner from Siemens Energy reported these vulnerabilities to Siemens.

Trust: 0.6

sources: CNNVD: CNNVD-202109-956

SOURCES

db:CNVDid:CNVD-2021-71445
db:VULMONid:CVE-2021-33720
db:JVNDBid:JVNDB-2021-012335
db:CNNVDid:CNNVD-202104-975
db:CNNVDid:CNNVD-202109-956
db:NVDid:CVE-2021-33720

LAST UPDATE DATE

2024-08-14T13:01:27.188000+00:00


SOURCES UPDATE DATE

db:CNVDid:CNVD-2021-71445date:2022-01-18T00:00:00
db:VULMONid:CVE-2021-33720date:2021-09-28T00:00:00
db:JVNDBid:JVNDB-2021-012335date:2022-08-30T02:02:00
db:CNNVDid:CNNVD-202104-975date:2021-04-14T00:00:00
db:CNNVDid:CNNVD-202109-956date:2021-10-13T00:00:00
db:NVDid:CVE-2021-33720date:2021-12-14T20:58:08.967

SOURCES RELEASE DATE

db:CNVDid:CNVD-2021-71445date:2021-09-16T00:00:00
db:VULMONid:CVE-2021-33720date:2021-09-14T00:00:00
db:JVNDBid:JVNDB-2021-012335date:2022-08-30T00:00:00
db:CNNVDid:CNNVD-202104-975date:2021-04-13T00:00:00
db:CNNVDid:CNNVD-202109-956date:2021-09-14T00:00:00
db:NVDid:CVE-2021-33720date:2021-09-14T11:15:24.540