Juniper Junos Space up to 24.1R4 risky encryption

CVSS Meta Temp Score
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CTI Interest Score
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4.7$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Juniper Junos Space up to 24.1R4. The impacted element is an unknown function. Executing a manipulation can lead to risky encryption. This vulnerability appears as CVE-2026-21907. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Juniper Junos Space up to 24.1R4. It has been declared as problematic. This vulnerability affects an unknown code block. The manipulation with an unknown input leads to a risky encryption vulnerability. The CWE definition for the vulnerability is CWE-327. The product uses a broken or risky cryptographic algorithm or protocol. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at supportportal.juniper.net. This vulnerability was named CVE-2026-21907 since 01/05/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 01/23/2026). This vulnerability is assigned to T1600 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 295032 (Juniper Networks Junos Space < 24.1R5 Use of a Broken or Risky Cryptographic Algorithm (JSA106006)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 24.1R5 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (295032). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.9
CNA Vector (juniper): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Risky encryption
CWE: CWE-327 / CWE-310
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 295032
Nessus Name: Juniper Networks Junos Space < 24.1R5 Use of a Broken or Risky Cryptographic Algorithm (JSA106006)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Junos Space 24.1R5

Timelineinfo

01/05/2026 CVE reserved
01/16/2026 +11 days Advisory disclosed
01/16/2026 +0 days VulDB entry created
01/23/2026 +7 days VulDB entry last update

Sourcesinfo

Vendor: juniper.net

Advisory: JSA106006
Status: Confirmed

CVE: CVE-2026-21907 (🔒)
GCVE (CVE): GCVE-0-2026-21907
GCVE (VulDB): GCVE-100-341458

Entryinfo

Created: 01/16/2026 09:18
Updated: 01/23/2026 04:01
Changes: 01/16/2026 09:18 (80), 01/23/2026 04:01 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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