CVE-2026-48685Network attack vector

Service interruption via extended-length BGP attribute misparsing

Published May 26, 2026 · Updated May 26, 2026

Out-of-bounds access in FastNetMon Community Edition 1.2.9 and earlier allows remote authenticated users to interrupt BGP update processing. The parse_raw_bgp_attribute() function treats a two-byte extended attribute length as one byte, so trailing value bytes become new attributes and parsing can access memory out of bounds. Control of BGP data accepted through the GoBGP or ExaBGP integration is required; the reported consequence is limited to service interruption.

CVSS severity6.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in FastNetMon Community Edition 1.2.9 and earlier allows remote authenticated users to interrupt BGP update processing. The parse_raw_bgp_attribute() function treats a two-byte extended attribute length as one byte, so trailing value bytes become new attributes and parsing can access memory out of bounds. Control of BGP data accepted through the GoBGP or ExaBGP integration is required; the reported consequence is limited to service interruption.

The record

CVE
CVE-2026-48685
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-130, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-130Improper Handling of Length Parameter Inconsistency
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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