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CIPster CVE-2026-76988

| EUVDEUVD-2026-63346 MEDIUM
Buffer Overflow (CWE-119)
2026-08-20 cna@vuldb.com GHSA-cgqh-cr58-mqgh
Buffer Overflow
5.5
CVSS 4.0 · Vendor: vuldb
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Severity by source

Vendor (vuldb) PRIMARY
5.5 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.5 MEDIUM

Network-accessible unauthenticated ForwardOpen (PR:N, AV:N); OOB read can expose adjacent memory (C:L); process crash causes availability loss (A:L).

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (vuldb).

CVSS VectorVendor: vuldb

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Aug 20, 2026 - 13:32 vuln.today
Analysis Generated
Aug 20, 2026 - 13:32 vuln.today

DescriptionCVE.org

A weakness has been identified in liftoff-sr CIPster 1802525be27d33e19a9a83c163e331a1d13b1892. This affects the function CipConnMgrClass::forward_open of the file cipconnectionmanager.cc of the component ForwardOpen Handler. Executing a manipulation of the argument product_code_ can lead to out-of-bounds read. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. This patch is called ea870a274bf68dfaa3f511f20e2fff6778fb7b74. A patch should be applied to remediate this issue.

AnalysisAI

Out-of-bounds read in CIPster (liftoff-sr, commit 1802525be27d) allows remote unauthenticated attackers to crash the EtherNet/IP stack by sending a crafted ForwardOpen request with a manipulated product_code_ argument to the CipConnMgrClass::forward_open handler in cipconnectionmanager.cc. The underlying defect is a missing class-type validation in ConnectionData::ResolveInstances, which permits crafted connection paths to reference instances of unexpected CIP object classes, triggering memory access beyond valid bounds. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify target device on EtherNet/IP port 44818
Delivery
Craft ForwardOpen request with invalid non-Assembly path class
Exploit
Send unauthenticated request over TCP to target
Execution
Trigger unvalidated class access in ResolveInstances
Impact
Out-of-bounds read crashes CIPster process
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Vulnerability AssessmentAI

Exploitation No authentication or prior session establishment is required: the CIP ForwardOpen service is an unauthenticated standard EtherNet/IP service accessible to any network peer on port 44818, which is the default operational mode for EtherNet/IP adapter and scanner devices. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 5.5 with vector AV:N/AC:L/AT:N/PR:N/UI:N reflects a remotely exploitable, unauthenticated attack with no special preconditions, but limits impact to low availability (VA:L) with no confidentiality or integrity impact per the CNA's assessment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker with network reachability to port 44818 on a device running unpatched CIPster crafts an EtherNet/IP ForwardOpen request that specifies a consuming or producing connection path pointing to a CIP instance of a non-Assembly class - for example, a CIP Identity or Message Router object - with a manipulated product_code_ value. The unpatched ResolveInstances function processes the path without verifying the instance class, causing an out-of-bounds read that corrupts or crashes the CIPster process and severs the device's EtherNet/IP connectivity. …
Remediation The upstream fix is available as commit ea870a274bf68dfaa3f511f20e2fff6778fb7b74 in the liftoff-sr/CIPster GitHub repository (https://github.com/liftoff-sr/CIPster/commit/ea870a274bf68dfaa3f511f20e2fff6778fb7b74); no tagged or versioned release incorporating this patch was identified from the available intelligence, so integrators should apply the commit directly to their source trees. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-76988 vulnerability details – vuln.today
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