CVE-2021-31352: SRC Series: NETCONF over SSH allows negotiation of weak ciphers

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-10-19 · updated 2026-06-17
Weakness: CWE-200

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.

Affected products

Juniper Session And Resource Control: before 4.130r6 — fixed in 4.130r6

How to fix

Upgrade to a fixed version: Juniper Session And Resource Control 4.130r6. Check the vendor advisory for mitigations.

References

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