How severe is CVE-2023-43135?

CVE-2023-43135 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-2023-43135 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-43135?

CVE-2023-43135 affects Tp-link Tl-er5120g Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-43135?

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-2023-43135 published?

CVE-2023-43135 was published on 2023-09-20 and last updated on 2026-06-17.

CVE-2023-43135

CVE-2023-43135 is a critical-severity vulnerability in Tp-link Tl-er5120g 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-862.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Tp-link Tl-er5120g Firmware
Published: 2023-09-20
Last modified: 2026-06-17

Description

There is an unauthorized access vulnerability in TP-LINK ER5120G 4.0 2.0.0 Build 210817 Rel.80868n, which allows attackers to obtain sensitive information of the device without authentication, obtain user tokens, and ultimately log in to the device backend management.

Frequently asked questions

What is CVE-2023-43135?: There is an unauthorized access vulnerability in TP-LINK ER5120G 4.0 2.0.0 Build 210817 Rel.80868n, which allows attackers to obtain sensitive information of the device without authentication, obtain user tokens, and ultimately log in to the device backend management.
How severe is CVE-2023-43135?: CVE-2023-43135 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-2023-43135 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-43135?: CVE-2023-43135 affects Tp-link Tl-er5120g Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-43135?: 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-2023-43135 published?: CVE-2023-43135 was published on 2023-09-20 and last updated on 2026-06-17.

References

https://github.com/7R4C4R/CVE/blob/main/TPLINK-TL-ER5120G/unauthorized%20access/Unauthorized%20Access%20Vulnerability.md

Affected products (1)

cpe:2.3:o:tp-link:tl-er5120g_firmware:2.0.0:build_210817:*:*:*:*:*:*

More vulnerabilities in Tp-link Tl-er5120g Firmware

CVE-2023-43138 — High (CVSS 8.8): TPLINK TL-ER5120G 4.0 2.0.0 Build 210817 Rel.80868n has a command injection vulnerability, when an attacker adds NAPT…
CVE-2023-43137 — High (CVSS 8.8): TPLINK TL-ER5120G 4.0 2.0.0 Build 210817 Rel.80868n has a command injection vulnerability, when an attacker adds ACL…
CVE-2017-16960 — High (CVSS 8.8): TP-Link TL-WVR, TL-WAR, TL-ER, and TL-R devices allow remote authenticated users to execute arbitrary commands via…
CVE-2017-16958 — High (CVSS 8.8): TP-Link TL-WVR, TL-WAR, TL-ER, and TL-R devices allow remote authenticated users to execute arbitrary commands via…
CVE-2017-16957 — High (CVSS 8.8): TP-Link TL-WVR, TL-WAR, TL-ER, and TL-R devices allow remote authenticated users to execute arbitrary commands via…
CVE-2017-16959 — Medium (CVSS 6.5): The locale feature in cgi-bin/luci on TP-Link TL-WVR, TL-WAR, TL-ER, and TL-R devices allows remote authenticated users…

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