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CVE-2026-103392medium4.8

Session Smart Router: A SACK option causes out-of-bounds memory access and TCP payload corruption when TCP sequence stitching is enabled

Impact

Juniper Networks Session Smart Router versions less than 7.0.5, 7.1.7, and 7.2.3 have an Out-of-Bounds Write vulnerability, allowing an attacker to corrupt TCP payload data via a transit TCP packet with an oversized SACK option length. The weakness is in TCP header processing when TCP sequence stitching is enabled. An attacker may cause session desynchronization.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

What to do

The following software releases of Session Smart Router have been updated to resolve these specific issues:

  • 7.0.5

and all subsequent releases;

  • 7.1.7

and all subsequent releases;

  • 7.2.3 and all subsequent releases.
juniper guidance

There are no known workarounds for this issue.

juniper guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Juniper Networks · juniper

Session Smart Router

3 ranges
juniper version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 7.0.5

custom versions

7.1.0 → before 7.1.7

custom versions

7.2.0 → before 7.2.3

custom versions

unaffected

unknown

Other versions: unaffected

Original source description

An Out-of-Bounds Write vulnerability in the TCP header processing in Juniper Networks Session Smart Router allows an attacker to corrupt TCP payload data and potentially cause session desynchronization via a transit TCP packet with an oversized SACK option length.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-103392

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-787 ↗

CWE-787 Out-of-bounds Write

juniper

Related →
Contributing organizations · 1
juniper

Assigning organization

2026-10-28

What changed

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References

1 sources
supportportal.juniper.net/JSA112183
vendor-advisoryjuniper