CVE-2023-0897Public exploitNetwork attack vector

Transmitter control via predictable cleartext session cookie

Published Oct 26, 2023 · Updated Jan 16, 2025

Session fixation in Sielco PolyEco1000 firmware allows remote attackers to hijack authenticated web sessions and control the transmitter. The HTTP interface uses a five-digit polyeco cookie, exposes the session identifier and credentials-derived login hash in a GET request, and provides no SSL. Exploitation requires either brute-forcing a live cookie or intercepting a user's cleartext login traffic, after which the session permits transmitter manipulation.

CVSS severity8.8
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session fixation in Sielco PolyEco1000 firmware allows remote attackers to hijack authenticated web sessions and control the transmitter. The HTTP interface uses a five-digit polyeco cookie, exposes the session identifier and credentials-derived login hash in a GET request, and provides no SSL. Exploitation requires either brute-forcing a live cookie or intercepting a user's cleartext login traffic, after which the session permits transmitter manipulation.

The record

CVE
CVE-2023-0897
Published
Oct 26, 2023
Updated
Jan 16, 2025
Vendor
Sielco
Product
PolyEco1000
Classifications
CWE-384, T0819
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 16, 2025Record 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=CPU:1.7.0 FPGA:10.16
  2. Affected versionversion=CPU:1.9.3 FPGA:10.19
  3. Affected versionversion=CPU:1.9.4 FPGA:10.19
  4. Affected versionversion=CPU:2.0.0 FPGA:10.19
  5. Affected versionversion=CPU:2.0.2 FPGA:10.19
  6. Affected versionversion=CPU:2.0.6 FPGA:10.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sielco · PolyEco1000version=CPU:1.7.0 FPGA:10.16; version=CPU:1.9.3 FPGA:10.19; version=CPU:1.9.4 FPGA:10.19; version=CPU:2.0.0 FPGA:10.19; version=CPU:2.0.2 FPGA:10.19; version=CPU:2.0.6 FPGA:10.19

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-384Session Fixation
T0819Exploit Public-Facing Application

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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