How severe is CVE-2021-31658?

CVE-2021-31658 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2021-31658 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31658?

CVE-2021-31658 primarily affects Tp-link Tl-sg2005 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-31658?

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.

When was CVE-2021-31658 published?

CVE-2021-31658 was published on 2021-06-10 and last updated on 2026-07-09.

CVE-2021-31658

CVE-2021-31658 is a high-severity vulnerability in Tp-link Tl-sg2005 Firmware with a CVSS 3.x base score of 8.1. 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-129.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 5.8
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-129
Affected product: Tp-link Tl-sg2005 Firmware
Published: 2021-06-10
Last modified: 2026-07-09

Description

TP-Link TL-SG2005, TL-SG2008, etc. 1.0.0 Build 20180529 Rel.40524 is affected by an Array index error. The interface that provides the "device description" function only judges the length of the received data, and does not filter special characters. This vulnerability will cause the application to crash, and all device configuration information will be erased.

Frequently asked questions

What is CVE-2021-31658?: TP-Link TL-SG2005, TL-SG2008, etc. 1.0.0 Build 20180529 Rel.40524 is affected by an Array index error. The interface that provides the "device description" function only judges the length of the received data, and does not filter special characters. This vulnerability will cause the application to crash, and all device configuration information will be erased.
How severe is CVE-2021-31658?: CVE-2021-31658 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2021-31658 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31658?: CVE-2021-31658 primarily affects Tp-link Tl-sg2005 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-31658?: 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.
When was CVE-2021-31658 published?: CVE-2021-31658 was published on 2021-06-10 and last updated on 2026-07-09.

References

https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-31658

Affected products (2)

cpe:2.3:o:tp-link:tl-sg2005_firmware:1.0.0:build_20180529_rel.40524:*:*:*:*:*:*
cpe:2.3:o:tp-link:tl-sg2008_firmware:1.0.0:build_20180529_rel.40524:*:*:*:*:*:*

More vulnerabilities in Tp-link Tl-sg2005 Firmware

CVE-2021-31659 — High (CVSS 8.8): TP-Link TL-SG2005, TL-SG2008, etc. 1.0.0 Build 20180529 Rel.40524 is vulnerable to Cross Site Request Forgery (CSRF).…

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Other CWE-129 (Improper Validation of Array Index) vulnerabilities

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