{"id":"CVE-2021-31352","state":"PUBLISHED","title":"SRC Series: NETCONF over SSH allows negotiation of weak ciphers","description":"An Information Exposure vulnerability in Juniper Networks SRC Series devices configured for NETCONF over SSH permits the negotiation of weak ciphers, which could allow a remote attacker to obtain sensitive information. A remote attacker with read and write access to network data could exploit this vulnerability to display plaintext bits from a block of ciphertext and obtain sensitive information. This issue affects all Juniper Networks SRC Series versions prior to 4.13.0-R6.","publishedAt":"2021-10-19T18:16:33.308Z","updatedAt":"2024-09-16T19:20:18.621Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","source":"juniper"},"assigner":"juniper","products":["Juniper Networks SRC Series"],"affected":[{"vendor":"Juniper Networks","product":"SRC Series","versions":[{"version":"unspecified","status":"affected","lessThan":"4.13.0-R6","versionType":"custom"}]}],"references":["https://kb.juniper.net/JSA11217"],"weaknesses":["CWE-200"],"ingestedAt":"2026-10-29T19:48:30.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/31xxx/CVE-2021-31352.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-31352","state":"PUBLISHED","datePublished":"2021-10-19T18:16:33.308Z","dateUpdated":"2024-09-16T19:20:18.621Z","assignerShortName":"juniper","assignerOrgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateReserved":"2021-04-15T00:00:00.000Z"},"containers":{"cna":{"title":"SRC Series: NETCONF over SSH allows negotiation of weak ciphers","descriptions":[{"lang":"en","value":"An Information Exposure vulnerability in Juniper Networks SRC Series devices configured for NETCONF over SSH permits the negotiation of weak ciphers, which could allow a remote attacker to obtain sensitive information. A remote attacker with read and write access to network data could exploit this vulnerability to display plaintext bits from a block of ciphertext and obtain sensitive information. This issue affects all Juniper Networks SRC Series versions prior to 4.13.0-R6."}],"affected":[{"vendor":"Juniper Networks","product":"SRC Series","versions":[{"version":"unspecified","status":"affected","lessThan":"4.13.0-R6","versionType":"custom"}]}],"references":[{"url":"https://kb.juniper.net/JSA11217","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-200","description":"CWE-200 Information Exposure","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"juniper","dateUpdated":"2021-10-19T18:16:33.000Z","orgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968"},"configurations":[{"lang":"en","value":"A sample configuration of NETCONF over SSH is shown below:\n\n  netconf {\n    ssh {\n      port 830;\n    }\n  }"}],"datePublic":"2021-10-13T00:00:00.000Z","exploits":[{"lang":"en","value":"Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}],"solutions":[{"lang":"en","value":"A hotfix has been created to resolve this issue.  Contact Juniper Networks Technical Support to request the hotfix.\n\nWeak ciphers are now disabled by default. Only the following ciphers and key-exchange (KEX) algorithms are now enabled by default:\n\n• Ciphers: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com\n• KEX Algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1\n\nNote: After upgrading to a fixed release, any manually configured weak ciphers or KEX algorithms for NETCONF will be retained.  Administrators should reset their cipher configuration by typing:\n  root@src# delete system services netconf ssh\n  root@src# commit\n  Stopping NETCONF/SSH:\n  commit complete.\n\n  root@src# set system services netconf ssh"}],"source":{"advisory":"JSA11217","defect":["1568322"],"discovery":"INTERNAL"},"workarounds":[{"lang":"en","value":"There are no viable workarounds for this issue."}],"x_generator":{"engine":"Vulnogram 0.0.9"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"sirt@juniper.net","DATE_PUBLIC":"2021-10-13T16:00:00.000Z","ID":"CVE-2021-31352","STATE":"PUBLIC","TITLE":"SRC Series: NETCONF over SSH allows negotiation of weak ciphers"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"SRC Series","version":{"version_data":[{"version_affected":"<","version_value":"4.13.0-R6"}]}}]},"vendor_name":"Juniper Networks"}]}},"configuration":[{"lang":"en","value":"A sample configuration of NETCONF over SSH is shown below:\n\n  netconf {\n    ssh {\n      port 830;\n    }\n  }"}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"An Information Exposure vulnerability in Juniper Networks SRC Series devices configured for NETCONF over SSH permits the negotiation of weak ciphers, which could allow a remote attacker to obtain sensitive information. A remote attacker with read and write access to network data could exploit this vulnerability to display plaintext bits from a block of ciphertext and obtain sensitive information. This issue affects all Juniper Networks SRC Series versions prior to 4.13.0-R6."}]},"exploit":[{"lang":"en","value":"Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}],"generator":{"engine":"Vulnogram 0.0.9"},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-200 Information Exposure"}]}]},"references":{"reference_data":[{"name":"https://kb.juniper.net/JSA11217","refsource":"CONFIRM","url":"https://kb.juniper.net/JSA11217"}]},"solution":[{"lang":"en","value":"A hotfix has been created to resolve this issue.  Contact Juniper Networks Technical Support to request the hotfix.\n\nWeak ciphers are now disabled by default. Only the following ciphers and key-exchange (KEX) algorithms are now enabled by default:\n\n• Ciphers: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com\n• KEX Algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1\n\nNote: After upgrading to a fixed release, any manually configured weak ciphers or KEX algorithms for NETCONF will be retained.  Administrators should reset their cipher configuration by typing:\n  root@src# delete system services netconf ssh\n  root@src# commit\n  Stopping NETCONF/SSH:\n  commit complete.\n\n  root@src# set system services netconf ssh"}],"source":{"advisory":"JSA11217","defect":["1568322"],"discovery":"INTERNAL"},"work_around":[{"lang":"en","value":"There are no viable workarounds for this issue."}]}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://kb.juniper.net/JSA11217","tags":["x_refsource_CONFIRM","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T22:55:53.552Z"}}]}}}