What is the CVSS score of CVE-2026-21907?

CVE-2026-21907 has a CVSS 3.1 base score of 5.9 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of TLS are affected by CVE-2026-21907?

CVE-2026-21907 presents moderate security risk, a broken cryptography vulnerability rated CVSS 5.9. Exploitation could compromise the security of affected deployments.

TLS CVE-2026-21907

MEDIUM

Use of a Broken or Risky Cryptographic Algorithm (CWE-327)

2026-01-15 sirt@juniper.net

TLS Juniper Junos Space

5.9

CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 15, 2026 - 21:16 nvd

MEDIUM 5.9

DescriptionNVD

A Use of a Broken or Risky Cryptographic Algorithm vulnerability in the TLS/SSL server of Juniper Networks Junos Space allows the use of static key ciphers (ssl-static-key-ciphers), reducing the confidentiality of on-path traffic communicated across the connection. These ciphers also do not support Perfect Forward Secrecy (PFS), affecting the long-term confidentiality of encrypted communications.This issue affects all versions of Junos Space before 24.1R5.

AnalysisAI

Junos Space versions up to 24.1 is affected by use of a broken or risky cryptographic algorithm (CVSS 5.9).

RemediationAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory