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CVE-2026-55732— Loytec LINX firmware: Out-of-bounds Read in BACnet packet parsing (bacdt_datetime_to_tod)

Quick assessment

Affected
Loytec LIP-ME20xC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LOYTEC LIP-ME20xC是LOYTEC公司的一款工业路由器。 LOYTEC LIP-ME201C、L-INX、L-GATE、L-ROC、L-IOB、L-DALI、L-VIS和L-PAD 8.4.18及之前版本存在缓冲区错误漏洞，该漏洞源于BACnet数据包解析（ ）存在越界读取，可能导致未经身份验证的远程攻击者通过畸形的BACnet时间同步或UTC时间同步数据包及无效月份值，造成 崩溃并最终重启设备。

CVSS 8.7 · High EPSS 0.54% · P46

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 8

VendorProduct Version RangeStatus
Loytec L-DALI ≤ 8.4.18 affected
Loytec L-GATE ≤ 8.4.18 affected
Loytec L-INX ≤ 8.4.18 affected
Loytec L-IOB ≤ 8.4.18 affected
Loytec L-PAD ≤ 8.4.18 affected
Loytec L-ROC ≤ 8.4.18 affected
Loytec L-VIS ≤ 8.4.18 affected
Loytec LIP-ME20xC ≤ 8.4.18 affected
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I. Basic Information for CVE-2026-55732

Vulnerability Information
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Vulnerability Title
Loytec LINX firmware: Out-of-bounds Read in BACnet packet parsing (bacdt_datetime_to_tod)
Source: CVE Program / CVE List V5
Vulnerability Description
Out-of-bounds Read (CWE-125) in BACnet packet parsing (`bacdt_datetime_to_tod`) in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.18 on LINX-A64 allows an unauthenticated remote attacker to crash `linx_a64.exe` and ultimately reboot the device via a malformed BACnet TimeSynchronization or UTC-TimeSynchronization packet with an invalid month value. The same vulnerability affects multiple other Loytec products.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
LOYTEC LIP-ME20xC 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LOYTEC LIP-ME20xC是LOYTEC公司的一款工业路由器。 LOYTEC LIP-ME201C、L-INX、L-GATE、L-ROC、L-IOB、L-DALI、L-VIS和L-PAD 8.4.18及之前版本存在缓冲区错误漏洞，该漏洞源于BACnet数据包解析（`bacdt_datetime_to_tod`）存在越界读取，可能导致未经身份验证的远程攻击者通过畸形的BACnet时间同步或UTC时间同步数据包及无效月份值，造成`linx_a64.exe`崩溃并最终重启设备。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Loytec LIP-ME20xC 0 ~ 8.4.18 -
Loytec L-INX 0 ~ 8.4.18 -
Loytec L-GATE 0 ~ 8.4.18 -
Loytec L-ROC 0 ~ 8.4.18 -
Loytec L-IOB 0 ~ 8.4.18 -
Loytec L-DALI 0 ~ 8.4.18 -
Loytec L-VIS 0 ~ 8.4.18 -
Loytec L-PAD 0 ~ 8.4.18 -

II. Public POCs for CVE-2026-55732

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III. Intelligence Information for CVE-2026-55732

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Vendor Advisories for CVE-2026-55732 (1)

Same Patch Batch · Loytec · 2026-07-24 · 9 CVEs total

CVE-2026-12503 9.2 CRITICAL Loytec LINX firmware: Improper Link Resolution in /usr/bin/larm_starter
CVE-2026-12496 8.7 HIGH Loytec LINX firmware: Unauthenticated stored XSS in OPC XML-DA server
CVE-2026-55730 8.7 HIGH Loytec LWEB802: Reflected Cross-Site Scripting in LWEB802
CVE-2026-12502 8.4 HIGH Loytec LINX firmware: Improper Privilege Management in /usr/bin/ltsudo
CVE-2026-12504 8.4 HIGH Loytec LINX firmware: Improper Authentication in PAM configuration
CVE-2026-55729 7.7 HIGH Loytec LWEB802: Exposure of Sensitive Information in browser localStorage
CVE-2026-55731 6.6 MEDIUM Loytec LINX firmware: Unchecked input for loop condition in the SNMP agent
CVE-2026-55728 3.8 LOW Loytec LINX firmware: Stack-based Buffer Overflow in cmd_ipaddr_conflict

IV. Related Vulnerabilities

Same product: LIP-ME20xC
Same vendor: Loytec
Same weakness: CWE-125