CVE-2023-38802Public exploitNetwork attack vector

BGP session reset via malformed tunnel attribute

Published Aug 29, 2023 · Updated Oct 2, 2024

Improper BGP update handling in FRRouting FRR 7.5.1 through 9.0 and Pica8 PICOS 4.3.3.2 allows remote attackers to reset BGP sessions. The bgpd Tunnel Encapsulation attribute parser terminates the peer session when flags, lengths, or sub-TLV lengths are malformed instead of treating the route as withdrawn. Reachability requires a crafted transitive attribute to arrive over a BGP peering path; repeated propagation can repeatedly interrupt routing traffic.

CVSS severity7.5
High
EPSS probability1.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper BGP update handling in FRRouting FRR 7.5.1 through 9.0 and Pica8 PICOS 4.3.3.2 allows remote attackers to reset BGP sessions. The bgpd Tunnel Encapsulation attribute parser terminates the peer session when flags, lengths, or sub-TLV lengths are malformed instead of treating the route as withdrawn. Reachability requires a crafted transitive attribute to arrive over a BGP peering path; repeated propagation can repeatedly interrupt routing traffic.

The record

CVE
CVE-2023-38802
Published
Aug 29, 2023
Updated
Oct 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-354, 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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-354Improper Validation of Integrity Check Value
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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