CVE-2016-6301

highpriority · track · 33EPSS 0.090 · 95 %ileDEEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
8.97% (95th) EPSS
CVSS 7.8 · high
Is it mine?
16 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

The recv_and_process_client_pkt function in networking/ntpd.c in busybox allows remote attackers to cause a denial of service (CPU and bandwidth consumption) via a forged NTP packet, which triggers a communication loop.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedphoenix_contact_psirt

    Update to Firmware Release 2019.0 LTS or later. Update to PLCnext Engineer Release 2019.0 LTS or later. Update A, 30.08.2019With Firmware Release 2019.6 an option was added to the web-basedmanagement that allows the user to permanently disable storage of configuration data to theSD-Card. The device can now be operated without SD-Card and ignores any inserted SD-Card.We recommend using this new configuration option for application scenarios where physicalaccess to the device cannot be restricted effectively. General Recommendation Customers using Phoenix Contact AXC F 2152 are recommended to operate the devices in closed networks or protected with a suitable firewall. For detailed information on our recommendations for measures to protect network-capable devices, please refer to our application note:'Art.-Nr. 107913: AH EN INDUSTRIAL SECURITY 'Measures to protect network-capable devices with Ethernet connection against unauthorized access'

  • Fixedwago_psirt

    Update your managed switch to the latest firmware: 852-303 (>= V1.2.2.S0) 852-1305 (>= V1.1.6.S0) 852-1505 (>= V1.1.5.S0) Firmwares published on Jun 7, 2019 or later are fixed. Please refer to the corresponding manual.

  • FixedAXC F 2152cisa_csaf_ot

    Follow the advice concerning SD card usage in the manual “Art.-Nr. 107708: UM EN AXC F 2152 Installing, starting up, and operating the AXC F 2152 controller um_en_axc_f_2152_107708_en_02.pdf” that can be found on the product page below:

    https://www.phoenixcontact.com/online/portal/us/?uri=pxc-oc-itemdetail:pid=2404267&library=usen&pcck=P-21-14-01&tab=1&selectedCategory=ALL
  • MitigationAXC F 2152cisa_csaf_ot

    Disable Basic128Rsa15 security policy in OPC Servers configuration. Use only Basic256 or higher.

  • MitigationSpectre RT ERT351cisa_csaf_ot

    For additional information, please see Advantech Security Advisory SA-2021-01-01

    https://ep.advantech-bb.cz/support/router-models/download/511/sa-2021-01-fw-5.1.3-and-older-en.pdf
02

cvss

Technical severity, 0–10. One row per scoring source.

10.0
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.9–10

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9
v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6
v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · Phoenix Contact PSIRT DE
v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · WAGO PSIRT DE
v3.010criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · CISA US
v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondaryexploitability 3.9 · impact 3.6
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-399USprimaryCWE-1103USCWE-20USCWE-835US
05

affected products (16)

Products and version ranges known to be affected.

06

advisories (4)

Vendor and ecosystem advisories describing this.

  • VDE-2019-009PHOENIX CONTACT: Multiple Vulnerabilities in AXC F 21522019-06-04csaf · phoenix_contact_psirtDE

    Multiple vulnerabilities have been identified in PHOENIX CONTACT AXC F 2152 with firmware versions 1.x

  • VDE-2019-013WAGO: Multiple Vulnerabilities in industrial managed switches2019-06-12csaf · wago_psirtDE

    Multiple vulnerabilities have been identified in WAGO 852-303, 852-1305 and 852-1505 industrial managed ethernet switches.

  • ICSA-19-155-01PHOENIX CONTACT PLCNext AXC F 21522019-06-04icsa · cisa_csaf_otUS

    Successful exploitation of these vulnerabilities could allow an attacker to decrypt passwords, bypass authentication, and deny service to the device. In addition, these vulnerabilities could interact with third-party vulnerabilities to cause other impacts to integrity, confidentiality, and availability.

  • ICSA-21-054-03Advantech Spectre RT Industrial Routers2021-02-23icsa · cisa_csaf_otUS

    Successful exploitation of these vulnerabilities may allow information disclosure, deletion of files, and remote code execution.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcisa_csaf_otnvdphoenix_contact_psirtwago_psirtNVDCVE.orgMITRE
published 2016-12-09modified 2026-06-17
10

references (45)

External citations — patches, advisories, analysis.

scry

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