How severe is CVE-2023-36355?

CVE-2023-36355 has a CVSS 3.x base score of 9.9, rated critical 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-2023-36355 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 32% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-36355?

CVE-2023-36355 affects Tp-link Tl-wr940n Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-36355?

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.

When was CVE-2023-36355 published?

CVE-2023-36355 was published on 2023-06-22 and last updated on 2026-06-17.

CVE-2023-36355

CVE-2023-36355 is a critical-severity vulnerability in Tp-link Tl-wr940n Firmware with a CVSS 3.x base score of 9.9. Its EPSS exploit-prediction score of 32% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
EPSS exploit prediction: 32% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Tp-link Tl-wr940n Firmware
Published: 2023-06-22
Last modified: 2026-06-17

Description

TP-Link TL-WR940N V4 was discovered to contain a buffer overflow via the ipStart parameter at /userRpm/WanDynamicIpV6CfgRpm. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted GET request.

Frequently asked questions

What is CVE-2023-36355?: TP-Link TL-WR940N V4 was discovered to contain a buffer overflow via the ipStart parameter at /userRpm/WanDynamicIpV6CfgRpm. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted GET request.
How severe is CVE-2023-36355?: CVE-2023-36355 has a CVSS 3.x base score of 9.9, rated critical 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-2023-36355 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 32% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-36355?: CVE-2023-36355 affects Tp-link Tl-wr940n Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-36355?: 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.
When was CVE-2023-36355 published?: CVE-2023-36355 was published on 2023-06-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tp-link:tl-wr940n_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Tp-link Tl-wr940n Firmware

CVE-2023-33538 — High (CVSS 8.8): TP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 was discovered to contain a command injection…
CVE-2022-43636 — High (CVSS 8.8): This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of TP-Link…
CVE-2022-24355 — High (CVSS 8.8): This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link…
CVE-2019-6989 — High (CVSS 8.8): TP-Link TL-WR940N is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the…
CVE-2025-6151 — High (CVSS 8.2): A vulnerability has been found in TP-Link TL-WR940N V4 and TL-WR841N V11. Affected by this issue is some unknown…
CVE-2023-33537 — High (CVSS 8.1): TP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 was discovered to contain a buffer overflow via the…

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