CVE-2021-31352
SRC Series: NETCONF over SSH allows negotiation of weak ciphers
02 Description
SRC Series: NETCONF over SSH allows negotiation of weak ciphers
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.83% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 57.2% of scored records. A rank, not a probability.
- NVD base score
- 5.3 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-10-19 18:16Z5 YR AGO
- Last updated
- 2024-09-16 19:20Z2 YR AGO
- Reserved
- 2021-04-15
- Assigning CNA
- juniper
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.3)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weaknesses
- Data version
- 5.1
- Document digest
- ddd35899d26c13b862288b547ccbe9ee7abdd7a6b76c4c083f16d2c68a4e72a2
05 Affected products
06 References
- kb.juniper.nethttps://kb.juniper.net/JSA11217
07 Remediation
A hotfix has been created to resolve this issue. Contact Juniper Networks Technical Support to request the hotfix. Weak ciphers are now disabled by default. Only the following ciphers and key-exchange (KEX) algorithms are now enabled by default: • Ciphers: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com • 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 Note: 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: root@src# delete system services netconf ssh root@src# commit Stopping NETCONF/SSH: commit complete. root@src# set system services netconf ssh