CVE-2023-41376Public exploitNetwork attack vector

Network disruption via malformed BGP path attributes

Published Aug 29, 2023 · Updated Oct 2, 2024

Improper BGP path-attribute handling in Nokia SR OS 22.10 and SR Linux allows remote attackers to repeatedly reset BGP sessions. A malformed optional transitive attribute can traverse routers that do not recognize it, then causes an affected receiver to close the BGP session instead of treating only the route as unreachable. The condition requires update-fault-tolerance to be disabled and can interrupt routed traffic until the poisoned update stops being reannounced.

CVSS severity7.5
High
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper BGP path-attribute handling in Nokia SR OS 22.10 and SR Linux allows remote attackers to repeatedly reset BGP sessions. A malformed optional transitive attribute can traverse routers that do not recognize it, then causes an affected receiver to close the BGP session instead of treating only the route as unreachable. The condition requires update-fault-tolerance to be disabled and can interrupt routed traffic until the poisoned update stops being reannounced.

The record

CVE
CVE-2023-41376
Published
Aug 29, 2023
Updated
Oct 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-670, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 2024Record 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-670Always-Incorrect Control Flow Implementation
T1498Network Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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