How severe is CVE-2025-45789?

CVE-2025-45789 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-45789 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-45789?

CVE-2025-45789 affects Totolink A3100r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-45789?

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

Does CVE-2025-45789 have an EU (EUVD) identifier?

Yes. CVE-2025-45789 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14038.

When was CVE-2025-45789 published?

CVE-2025-45789 was published on 2025-05-08 and last updated on 2026-06-17.

CVE-2025-45789

CVE-2025-45789 is a critical-severity vulnerability in Totolink A3100r Firmware with a CVSS 3.x base score of 9.8. 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: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-14038
Weakness: CWE-787
Affected product: Totolink A3100r Firmware
Published: 2025-05-08
Last modified: 2026-06-17

Description

TOTOLINK A3100R V5.9c.1527 is vulnerable to buffer overflow via the urlKeyword parameter in setParentalRules.

Frequently asked questions

What is CVE-2025-45789?: TOTOLINK A3100R V5.9c.1527 is vulnerable to buffer overflow via the urlKeyword parameter in setParentalRules.
How severe is CVE-2025-45789?: CVE-2025-45789 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-45789 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-45789?: CVE-2025-45789 affects Totolink A3100r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-45789?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-45789 have an EU (EUVD) identifier?: Yes. CVE-2025-45789 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14038.
When was CVE-2025-45789 published?: CVE-2025-45789 was published on 2025-05-08 and last updated on 2026-06-17.

References

https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3100R-3/README.md

Affected products (1)

cpe:2.3:o:totolink:a3100r_firmware:5.9c.1527:*:*:*:*:*:*:*

More vulnerabilities in Totolink A3100r Firmware

CVE-2025-45790 — Critical (CVSS 9.8): TOTOLINK A3100R V5.9c.1527 is vulnerable to Buffer Overflow via the priority parameter in the setMacQos interface of…
CVE-2025-45788 — Critical (CVSS 9.8): TOTOLINK A3100R V5.9c.1527 is vulnerable to Buffer Overflow via the comment parameter in setMacFilterRules.
CVE-2025-45787 — Critical (CVSS 9.8): TOTOLINK A3100R V5.9c.1527 is vulnerable to Buffer Overflow viathe comment parameter in setIpPortFilterRules.
CVE-2025-28036 — Critical (CVSS 9.8): TOTOLINK A950RG V4.1.2cu.5161_B20200903 was found to contain a pre-auth remote command execution vulnerability in the…
CVE-2025-28035 — Critical (CVSS 9.8): TOTOLINK A830R V4.1.2cu.5182_B20201102 was found to contain a pre-auth remote command execution vulnerability in the…
CVE-2025-28034 — Critical (CVSS 9.8): TOTOLINK A800R V4.1.2cu.5137_B20200730, A810R V4.1.2cu.5182_B20201026, A830R V4.1.2cu.5182_B20201102, A950RG…

All CVEs affecting Totolink A3100r Firmware →

Other CWE-787 (Out-of-bounds Write) vulnerabilities

CVE-2026-42369 — Critical (CVSS 10.0): GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other…
CVE-2026-4746 — Critical (CVSS 10.0): Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is…
CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…

Browse all CWE-787 (Out-of-bounds Write) vulnerabilities →