CVE-2019-16026Network attack vector

eNodeB service interruption via crafted SCTP message

Published Jan 26, 2020 · Updated Nov 15, 2024

Improper input validation in Cisco StarOS before 21.16.1 allows remote attackers to interrupt eNodeB service via crafted SCTP traffic. The MME implementation accepts a crafted SCTP message without sufficient validation and then stops sending SCTP messages to the connected eNodeB. Exploitation requires a man-in-the-middle position between the eNodeB and MME; the resulting interruption affects availability without reported data disclosure or modification.

CVSS severity6.8
Medium
EPSS probability1.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Cisco StarOS before 21.16.1 allows remote attackers to interrupt eNodeB service via crafted SCTP traffic. The MME implementation accepts a crafted SCTP message without sufficient validation and then stops sending SCTP messages to the connected eNodeB. Exploitation requires a man-in-the-middle position between the eNodeB and MME; the resulting interruption affects availability without reported data disclosure or modification.

The record

CVE
CVE-2019-16026
Published
Jan 26, 2020
Updated
Nov 15, 2024
Vendor
ClamAV
Product
Cisco ASR 5000 Series Software
Classifications
CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 26, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco ASR 5000 Series Softwareversion=unspecified <n/a

Published CVSS scores

6.8Cisco Systems, Inc.CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.9NIST NVDCVSS:3.1/AV:N/AC:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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