How severe is CVE-2024-42547?

CVE-2024-42547 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-2024-42547 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-42547?

CVE-2024-42547 affects Totolink A3100r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-42547?

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-2024-42547 have an EU (EUVD) identifier?

Yes. CVE-2024-42547 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-39665.

When was CVE-2024-42547 published?

CVE-2024-42547 was published on 2024-08-12 and last updated on 2026-06-17.

CVE-2024-42547

CVE-2024-42547 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-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-39665
Weakness: CWE-120
Affected product: Totolink A3100r Firmware
Published: 2024-08-12
Last modified: 2026-06-17

Description

TOTOLINK A3100R V4.1.2cu.5050_B20200504 has a buffer overflow vulnerability in the http_host parameter in the loginauth function.

Frequently asked questions

What is CVE-2024-42547?: TOTOLINK A3100R V4.1.2cu.5050_B20200504 has a buffer overflow vulnerability in the http_host parameter in the loginauth function.
How severe is CVE-2024-42547?: CVE-2024-42547 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-2024-42547 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-42547?: CVE-2024-42547 affects Totolink A3100r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-42547?: 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-2024-42547 have an EU (EUVD) identifier?: Yes. CVE-2024-42547 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-39665.
When was CVE-2024-42547 published?: CVE-2024-42547 was published on 2024-08-12 and last updated on 2026-06-17.

References

https://github.com/noahze01/IoT-vulnerable/blob/main/TOTOLink/A3100R/loginauth.md

Affected products (1)

cpe:2.3:o:totolink:a3100r_firmware:4.1.2cu.5050_b20200504:*:*:*:*:*:*:*

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-2025-45789 — Critical (CVSS 9.8): TOTOLINK A3100R V5.9c.1527 is vulnerable to buffer overflow via the urlKeyword parameter in setParentalRules.
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…

All CVEs affecting Totolink A3100r Firmware →

Other CWE-120 (Classic Buffer Overflow) vulnerabilities

CVE-2025-48611 — Critical (CVSS 10.0): In DeviceId of DeviceId.java, there is a possible desync in persistence due to a missing bounds check. This could lead…
CVE-2026-24823 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in FASTSHIFT…
CVE-2026-24810 — Critical (CVSS 10.0): Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in rethinkdb (src/cjson modules).…
CVE-2026-24800 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in tildearrow…
CVE-2025-9962 — Critical (CVSS 10.0): A buffer overflow vulnerability in Novakon P series allows attackers to gain root permission without prior…
CVE-2010-10016 — Critical (CVSS 10.0): BS.Player version 2.57 (build 1051) contains a vulnerability in its playlist import functionality. When processing .m3u…

Browse all CWE-120 (Classic Buffer Overflow) vulnerabilities →