How severe is CVE-2021-35296?

CVE-2021-35296 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-2021-35296 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-35296?

CVE-2021-35296 affects Ptcl Hg150-ub Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-35296?

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-2021-35296 published?

CVE-2021-35296 was published on 2021-10-04 and last updated on 2026-06-17.

CVE-2021-35296

CVE-2021-35296 is a critical-severity vulnerability in Ptcl Hg150-ub 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-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Ptcl Hg150-ub Firmware
Published: 2021-10-04
Last modified: 2026-06-17

Description

An issue in the administrator authentication panel of PTCL HG150-Ub v3.0 allows attackers to bypass authentication via modification of the cookie value and Response Path.

Frequently asked questions

What is CVE-2021-35296?: An issue in the administrator authentication panel of PTCL HG150-Ub v3.0 allows attackers to bypass authentication via modification of the cookie value and Response Path.
How severe is CVE-2021-35296?: CVE-2021-35296 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-2021-35296 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-35296?: CVE-2021-35296 affects Ptcl Hg150-ub Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-35296?: 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-2021-35296 published?: CVE-2021-35296 was published on 2021-10-04 and last updated on 2026-06-17.

References

https://github.com/afaq1337/CVE-2021-35296

Affected products (1)

cpe:2.3:o:ptcl:hg150-ub_firmware:3.0:*:*:*:*:*:*:*

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