Medium severity · published Oct 28, 2026
CVE-2026-103392
Session Smart Router: A SACK option causes out-of-bounds memory access and TCP payload corruption when TCP sequence stitching is enabled
New
4.8
CVSS
–
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SS
Session Smart Router · Juniper Networks
before 7.0.5; 7.1.0 before 7.1.7; 7.2.0 before 7.2.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103392
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103392
vendor-advisory
https://supportportal.juniper.net/JSA112183
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