A vulnerability has been identified in Siemens APOGEE PXC and TALON TC BACnet Automation Controllers in all versions <V3.5.

published 2017-10-23 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-18857

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 8.2%; EPSS 8.2% chance of exploitation in 30 days, percentile 94%
public exploits: 0; none known

A vulnerability has been identified in Siemens APOGEE PXC and TALON TC BACnet Automation Controllers in all versions <V3.5. A directory traversal vulnerability could allow a remote attacker with network access to the integrated web server (80/tcp and 443/tcp) to obtain information on the structure of the file system of the affected devices.

Patch / fix

fixed in 4

siemens apogee_pxc_firmware 3.5
siemens apogee_pxc_modular_firmware 3.5
siemens talon_tc_compact_firmware 3.5
siemens talon_tc_modular_firmware 3.5

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-17-285-05 updated 2022-06-14 cvss 5.3

Siemens BACnet Field Panels (Update A)

Siemens APOGEE PXC Compact (BACnet) <V3.5
affected: fixed in V3.5, mitigation partnerportal.extranet.dc.siemens.com
Siemens APOGEE PXC Compact (P2 Ethernet)
affected: mitigation, no fix planned
Siemens APOGEE PXC Modular (BACnet) <V3.5
affected: fixed in V3.5, mitigation partnerportal.extranet.dc.siemens.com
Siemens APOGEE PXC Modular (P2 Ethernet)
affected: mitigation, no fix planned
Siemens TALON TC Compact (BACnet) <V3.5 Siemens TALON TC Modular (BACnet) <V3.5
affected: fixed in V3.5, mitigation partnerportal.extranet.dc.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 5 mo ago (2026-06-02)

Exploit prediction

8.19% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

packetstorm.news https://packetstorm.news/files/id/169544 referenced PoC, tagged "exploit" by a source, unverified
packetstormsecurity.com http://packetstormsecurity.com/files/169544/Siemens-APOGEE-PXC-TALON-TC-Authentication-Bypass.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

n/a APOGEE PXC and TALON TC BACnet Automation Controllers All versions <V3.5

Classification

Weakness

CWE-538 Insertion of Sensitive Information into Externally-Accessible File or Directory
CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

packetstorm.news /files/id/169544
exploit
packetstormsecurity.com /files/169544/Siemens-APOGEE-PXC-TALON-TC-Authentication-Bypass.html
exploit, third-party-advisory, vdb-entry
siemens.com /cert/pool/cert/siemens_security_advisory_ssa-148078.pdf
broken-link, vendor-advisory
cert-portal.siemens.com /productcert/pdf/ssa-148078.pdf
vendor-advisory
securityfocus.com /bid/101248
vdb-entry, broken-link, third-party-advisory

Sources

CVE List CVE-2017-9947
NVD CVE-2017-9947

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary