How severe is CVE-2025-5503?

CVE-2025-5503 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-5503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-5503?

CVE-2025-5503 affects Totolink X15 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-5503?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-5503 have an EU (EUVD) identifier?

Yes. CVE-2025-5503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16742.

When was CVE-2025-5503 published?

CVE-2025-5503 was published on 2025-06-03 and last updated on 2026-06-17.

CVE-2025-5503

CVE-2025-5503 is a high-severity vulnerability in Totolink X15 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 8.7
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16742
Weakness: CWE-787
Affected product: Totolink X15 Firmware
Published: 2025-06-03
Last modified: 2026-06-17

Description

A vulnerability, which was classified as critical, was found in TOTOLINK X15 1.0.0-B20230714.1105. This affects the function formMapReboot of the file /boafrm/formMapReboot. The manipulation of the argument deviceMacAddr leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Frequently asked questions

What is CVE-2025-5503?: A vulnerability, which was classified as critical, was found in TOTOLINK X15 1.0.0-B20230714.1105. This affects the function formMapReboot of the file /boafrm/formMapReboot. The manipulation of the argument deviceMacAddr leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
How severe is CVE-2025-5503?: CVE-2025-5503 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-5503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-5503?: CVE-2025-5503 affects Totolink X15 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-5503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-5503 have an EU (EUVD) identifier?: Yes. CVE-2025-5503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16742.
When was CVE-2025-5503 published?: CVE-2025-5503 was published on 2025-06-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:totolink:x15_firmware:1.0.0-b20230714.1105:*:*:*:*:*:*:*

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