CVE-2016-9952

mediumpriority · track · 32EPSS 0.013 · 70 %ileDEEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
1.28% (70th) EPSS
CVSS 6.8 · medium
Is it mine?
12 products
Check your exposure
Who says so?
7 sources
cnnvd · enisa_euvd · cert_bund · cisa_csaf_ot

EPSS · scored 2026-10-22

The verify_certificate function in lib/vtls/schannel.c in libcurl 7.30.0 through 7.51.0, when built for Windows CE using the schannel TLS backend, makes it easier for remote attackers to conduct man-in-the-middle attacks via a crafted wildcard SAN in a server certificate, as demonstrated by "*.com."

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, 30.08.2019 With Firmware Release 2019.6 an option was added to the web-based management that allows the user to permanently disable storage of configuration data to the SD-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 physical access to the device cannot be restricted effectively.Update to Firmware Release 2019.0 LTS or later. Update to PLCnext Engineer Release 2019.0 LTS or later. Update A, 30.08.2019 With Firmware Release 2019.6 an option was added to the web-based management that allows the user to permanently disable storage of configuration data to the SD-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 physical access to the device cannot be restricted effectively.

  • 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.

02

cvss

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

8.1
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.1

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4
v3.08.1highCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.2 · impact 5.9
v3.08.1highCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · Phoenix Contact PSIRT DE
v3.08.1highCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · CISA US
v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU
v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 2.2 · impact 5.9
v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
03

ssvc

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

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-295USprimaryCWE-295USCWE-295US
05

affected products (12)

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

  • WID-SEC-W-2026-0180Dell Data Protection Advisor: Mehrere SchwachstellenDeutsch2026-01-20csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Dell Data Protection Advisor ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand zu erzeugen, Sicherheitsmaßnahmen zu umgehen und nicht näher spezifizierte Angriffe zu starten.

  • 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.

  • CURL-CVE-2016-9952Win CE Schannel cert wildcard matches too much2016-12-21vendor · osvUS

    curl's TLS server certificate checks are flawed on Windows CE. This vulnerability occurs in the verify certificate function when comparing a wildcard certificate name (as returned by the Windows API function `CertGetNameString)` to the hostname used to make the connection to the server. The vulnerability can be triggered with an overly permissive wildcard SAN in the server certificate such as a DNS name of `*.com`. When the function compares the cert name to the connection hostname, the wildcard character is removed from the cert name and the connection hostname is checked to see if it ends with the modified cert name. This means a hostname of example.com would match a DNS SAN of `*.com`, among other variations. This approach violates recommendations in RFC 6125 and could lead to MITM attacks.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcert_bundcisa_csaf_otnvdphoenix_contact_psirtosvNVDCVE.orgMITRE
published 2018-03-12modified 2026-06-17
10

references (6)

External citations — patches, advisories, analysis.

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