Juniper Junos OS up to 25.2R1-S2 kmd/iked improper validation of syntactic correctness of input

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Juniper Junos OS up to 25.2R1-S2. The affected element is an unknown function of the component kmd/iked. Executing a manipulation can lead to improper validation of syntactic correctness of input. This vulnerability is tracked as CVE-2026-33778. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Juniper Junos OS up to 25.2R1-S2 and classified as critical. This vulnerability affects an unknown function of the component kmd/iked. The manipulation with an unknown input leads to a improper validation of syntactic correctness of input vulnerability. The CWE definition for the vulnerability is CWE-1286. The product receives input that is expected to be well-formed - i.e., to comply with a certain syntax - but it does not validate or incorrectly validates that the input complies with the syntax. As an impact it is known to affect availability. CVE summarizes:

An Improper Validation of Syntactic Correctness of Input vulnerability in the IPsec library used by kmd and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS). If an affected device receives a specifically malformed first ISAKMP packet from the initiator, the kmd/iked process will crash and restart, which momentarily prevents new security associations (SAs) for from being established. Repeated exploitation of this vulnerability causes a complete inability to establish new VPN connections. This issue affects Junos OS on SRX Series and MX Series: * all versions before 22.4R3-S9, * 23.2 version before 23.2R2-S6, * 23.4 version before 23.4R2-S7, * 24.2 versions before 24.2R2-S4, * 24.4 versions before 24.4R2-S3, * 25.2 versions before 25.2R1-S2, 25.2R2.

The advisory is shared for download at kb.juniper.net. This vulnerability was named CVE-2026-33778 since 03/23/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/13/2026).

The vulnerability scanner Nessus provides a plugin with the ID 305590 (Juniper Junos OS Vulnerability (JSA107868)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 22.4R3-S9, 23.2R2-S6, 23.4R2-S7, 24.2R2-S4, 24.4R2-S3, 25.2R1-S2 or 25.2R2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (305590). Once again VulDB remains the best source for vulnerability data.

Productinfo

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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: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (juniper): 🔒

CVSSv2info

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

Exploitinginfo

Class: Improper validation of syntactic correctness of input
CWE: CWE-1286 / CWE-20
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: 305590
Nessus Name: Juniper Junos OS Vulnerability (JSA107868)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Junos OS 22.4R3-S9/23.2R2-S6/23.4R2-S7/24.2R2-S4/24.4R2-S3/25.2R1-S2/25.2R2

Timelineinfo

03/23/2026 CVE reserved
04/10/2026 +17 days Advisory disclosed
04/10/2026 +0 days VulDB entry created
04/13/2026 +3 days VulDB entry last update

Sourcesinfo

Vendor: juniper.net

Advisory: JSA107868
Status: Confirmed

CVE: CVE-2026-33778 (🔒)
GCVE (CVE): GCVE-0-2026-33778
GCVE (VulDB): GCVE-100-356692

Entryinfo

Created: 04/10/2026 06:11
Updated: 04/13/2026 20:53
Changes: 04/10/2026 06:11 (79), 04/13/2026 20:53 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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