CVE-2024-47502

Junos OS Evolved: TCP session state is not always cleared on the Routing Engine leading to DoS

HIGH

7.5

CVSS Score

Published: October 11, 2024 at 03:31 PM UTC

Updated: June 17, 2026 at 07:57 AM UTC

2 products affected across 2 vendorsJunos OS EvolvedJunos OS Evolved

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Severity

HIGH7.5

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

Description

An Allocation of Resources Without Limits or Throttling vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network based attacker to cause a Denial of Service (DoS). In specific cases the state of TCP sessions that are terminated is not cleared, which over time leads to an exhaustion of resources, preventing new connections to the control plane from being established. A continuously increasing number of connections shown by: user@host > show system connections is indicative of the problem. To recover the respective RE needs to be restarted manually. This issue only affects IPv4 but does not affect IPv6. This issue only affects TCP sessions established in-band (over an interface on an FPC) but not out-of-band (over the management ethernet port on the routing-engine). This issue affects Junos OS Evolved: * All versions before 21.4R3-S9-EVO, * 22.2 versions before 22.2R3-S4-EVO, * 22.4 version before 22.4R3-S3-EVO, * 23.2 versions before 23.2R2-S1-EVO, * 23.4 versions before 23.4R2-EVO.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos OS Evolved · Juniper

95%

v < 21.4v < 21.4r3-s9-evo22.2 ≤ v < 22.2r3-s4-evo22.4 ≤ v < 22.4r3-s3-evo23.2 ≤ v < 23.2r2-s1-evo23.4 ≤ v < 23.4r2-evo21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 21.4 r2 21.4 r2-s1 21.4 r2-s2 21.4 r3 21.4 r3-s1 21.4 r3-s2 21.4 r3-s3 21.4 r3-s4 21.4 r3-s5 21.4 r3-s6 21.4 r3-s7 21.4 r3-s8 22.2 22.2 r1 22.2 r1-s1 22.2 r1-s2 22.2 r2 22.2 r2-s1 22.2 r2-s2 22.2 r3 22.2 r3-s1 22.2 r3-s2 22.2 r3-s3 22.4 22.4 r1 22.4 r1-s1 22.4 r1-s2 22.4 r2 22.4 r2-s1 22.4 r2-s2 22.4 r3 22.4 r3-s1 22.4 r3-s2 23.2 23.2 r1 23.2 r1-s1 23.2 r1-s2 23.2 r2 23.4 23.4 r1 23.4 r1-s1 23.4 r1-s2

Affected range stops below 21.4r3-s9-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2r3-s4-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4r3-s3-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2r2-s1-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.4r2-evo, so it looks safe — our inference, not a vendor statement

Junos OS Evolved · Juniper Networks

60%

v < 21.4R3-S9-EVO22.2 ≤ v < 22.2R3-S4-EVO22.4 ≤ v < 22.4R3-S3-EVO23.2 ≤ v < 23.2R2-S1-EVO23.4 ≤ v < 23.4R2-EVO22.2 22.4 23.2 23.4

Affected range stops below 21.4R3-S9-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-S4-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R3-S3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2-S1-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.4R2-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://supportportal.juniper.net/JSA88132

References (1)

Vendor Advisory

Source: [email protected]

https://supportportal.juniper.net/JSA88132

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHjuniper

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-770

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