lwIP 2.0.0 through 2.2.1 built with the SNMP agent contains an out-of-bounds read vulnerability in snmp_pbuf_stream_writeto() that bounds copies by pbuf->len instead of remaining bytes. Remote unauthenticated attackers knowing the read community can send fragmented SNMP requests to receive adjacent receive-buffer or pool memory echoed in responses.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00482.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
lwIP lwIP unaffected
Version Status Constraints
2.0.0 affected ≤ 2.2.1

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/lwip-tcpip/lwip cve-icon cve-icon
https://github.com/lwip-tcpip/lwip/blob/77dcd25a72509eb83f72b033d219b1d40cd8eb95/src/apps/snmp/snmp_pbuf_stream.c#L111-L122 cve-icon cve-icon
https://github.com/lwip-tcpip/lwip/commit/e98415014aca66ef0daefded8020763b9279a3b2 cve-icon cve-icon
https://www.vulncheck.com/advisories/lwip-2.0.0-through-2.2.1-snmp-agent-out-of-bounds-read-via-snmp-pbuf-stream-writeto cve-icon cve-icon
History

Thu, 29 Oct 2026 23:30:00 +0000

Type Values Removed Values Added
First Time appeared Lwip
Lwip lwip
Vendors & Products Lwip
Lwip lwip

Thu, 29 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 29 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Description lwIP 2.0.0 through 2.2.1 built with the SNMP agent contains an out-of-bounds read vulnerability in snmp_pbuf_stream_writeto() that bounds copies by pbuf->len instead of remaining bytes. Remote unauthenticated attackers knowing the read community can send fragmented SNMP requests to receive adjacent receive-buffer or pool memory echoed in responses.
Title lwIP 2.0.0 through 2.2.1 SNMP Agent Out-of-Bounds Read via snmp_pbuf_stream_writeto()
First Time appeared Lwip Project
Lwip Project lwip
Weaknesses CWE-125
CPEs cpe:2.3:a:lwip_project:lwip:*:*:*:*:*:*:*:*
Vendors & Products Lwip Project
Lwip Project lwip
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-29T14:01:51.233Z

Reserved: 2026-10-29T11:51:52.064Z

Link: CVE-2026-119053

cve-icon Vulnrichment

Updated: 2026-10-29T14:01:42.200Z

cve-icon NVD

Status : Deferred

Published: 2026-10-29T14:17:52.463

Modified: 2026-10-29T16:21:34.310

Link: CVE-2026-119053

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-29T23:15:04Z

Weaknesses