Loytec LIP-ME20xC up to 8.4.16 server.pem link following

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Loytec LIP-ME20xC, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD up to 8.4.16. Impacted is an unknown function of the file /etc/lighttpd/ssl/server.pem. This manipulation causes link following. This vulnerability is registered as CVE-2026-12503. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as very critical was found in Loytec LIP-ME20xC, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD up to 8.4.16. Affected by this vulnerability is an unknown functionality of the file /etc/lighttpd/ssl/server.pem. The manipulation with an unknown input leads to a link following vulnerability. The CWE definition for the vulnerability is CWE-59. The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Improper Link Resolution (CWE-59) in `/usr/bin/larm_starter` in Loytec L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows an authenticated `larmapp` attacker to make `/etc/passwd` writable by the `larmapp` group (leading to root privilege escalation) via a symlink attack on `/etc/lighttpd/ssl/server.pem`.

It is possible to read the advisory at loytec.com. This vulnerability is known as CVE-2026-12503 since 06/17/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/24/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Loytec

Name

• L-DALI
• L-GATE
• L-INX
• L-IOB
• L-PAD
• L-ROC
• L-VIS
• LIP-ME20xC

Version

• 8.4.0
• 8.4.1
• 8.4.2
• 8.4.3
• 8.4.4
• 8.4.5
• 8.4.6
• 8.4.7
• 8.4.8
• 8.4.9
• 8.4.10
• 8.4.11
• 8.4.12
• 8.4.13
• 8.4.14
• 8.4.15
• 8.4.16

CPE 2.3info

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CPE 2.2info

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