How severe is CVE-2021-45428?

CVE-2021-45428 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-2021-45428 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 57% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45428?

CVE-2021-45428 affects Telesquare Tlr-2005ksh Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45428?

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-2021-45428 published?

CVE-2021-45428 was published on 2022-01-03 and last updated on 2026-06-17.

CVE-2021-45428

CVE-2021-45428 is a critical-severity vulnerability in Telesquare Tlr-2005ksh Firmware with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 57% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-639.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 57% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-639
Affected product: Telesquare Tlr-2005ksh Firmware
Published: 2022-01-03
Last modified: 2026-06-17

Description

TLR-2005KSH is affected by an incorrect access control vulnerability. THe PUT method is enabled so an attacker can upload arbitrary files including HTML and CGI formats.

Frequently asked questions

What is CVE-2021-45428?: TLR-2005KSH is affected by an incorrect access control vulnerability. THe PUT method is enabled so an attacker can upload arbitrary files including HTML and CGI formats.
How severe is CVE-2021-45428?: CVE-2021-45428 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-2021-45428 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 57% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45428?: CVE-2021-45428 affects Telesquare Tlr-2005ksh Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45428?: 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-2021-45428 published?: CVE-2021-45428 was published on 2022-01-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:telesquare:tlr-2005ksh_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Telesquare Tlr-2005ksh Firmware

CVE-2025-26011 — Critical (CVSS 9.8): Telesquare TLR-2005KSH 1.1.4 has an unauthorized stack overflow vulnerability when requesting the admin.cgi parameter…
CVE-2025-26010 — Critical (CVSS 9.8): Telesquare TLR-2005KSH 1.1.4 allows unauthorized password modification when requesting the admin.cgi parameter with…
CVE-2025-26008 — Critical (CVSS 9.8): In Telesquare TLR-2005KSH 1.1.4, an unauthorized stack overflow vulnerability exists when requesting admin.cgi…
CVE-2025-26007 — Critical (CVSS 9.8): Telesquare TLR-2005KSH 1.1.4 has an unauthorized stack overflow vulnerability in the login interface when requesting…
CVE-2025-26006 — Critical (CVSS 9.8): Telesquare TLR-2005KSH 1.1.4 has an unauthorized stack overflow vulnerability when requesting the admin.cgi parameter…
CVE-2025-26005 — Critical (CVSS 9.8): Telesquare TLR-2005KSH 1.1.4 is vulnerable to unauthorized stack overflow vulnerability when requesting admin.cgi…

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