CVE-2023-4463Public exploitNetwork attack vector

Device reboot via valueless session cookie

Published Dec 29, 2023 · Updated Aug 2, 2024

Improper input validation in the HTTP server of affected Poly phones allows remote attackers to crash and reboot devices over the network. The C++ HTTP parser fails when a Cookie header contains the expected session name without a corresponding value. The web server must be enabled; repeated unauthenticated requests keep the phone unavailable until the traffic stops.

CVSS severity7.5
High
EPSS probability1.01%
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 the HTTP server of affected Poly phones allows remote attackers to crash and reboot devices over the network. The C++ HTTP parser fails when a Cookie header contains the expected session name without a corresponding value. The web server must be enabled; repeated unauthenticated requests keep the phone unavailable until the traffic stops.

The record

CVE
CVE-2023-4463
Published
Dec 29, 2023
Updated
Aug 2, 2024
Vendor
Plantronics
Product
Poly CCX 600
Classifications
CWE-20, CWE-404, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 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?

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

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Plantronics · Poly CCX 600version=n/a
Plantronics · HP Poly Trio C60version=n/a
Plantronics · Poly Trio 8800version=n/a
Plantronics · Poly CCX 400version=n/a

Published CVSS scores

7.5HPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5modzeroCVSS:3.0/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-20Improper Input Validation
CWE-404Improper Resource Shutdown or Release
T1499Endpoint 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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