How severe is CVE-2015-2055?

CVE-2015-2055 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2015-2055 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-2055?

CVE-2015-2055 affects Zhone Technologies Gpon 2520 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-2055?

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-2015-2055 published?

CVE-2015-2055 was published on 2015-02-23 and last updated on 2026-06-17.

CVE-2015-2055

CVE-2015-2055 is a high-severity vulnerability in Zhone Technologies Gpon 2520 Firmware with a CVSS 2.0 base score of 7.8. 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-20.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Zhone Technologies Gpon 2520 Firmware
Published: 2015-02-23
Last modified: 2026-06-17

Description

Zhone GPON 2520 with firmware R4.0.2.566b allows remote attackers to cause a denial of service via a long string in the oldpassword parameter.

Frequently asked questions

What is CVE-2015-2055?: Zhone GPON 2520 with firmware R4.0.2.566b allows remote attackers to cause a denial of service via a long string in the oldpassword parameter.
How severe is CVE-2015-2055?: CVE-2015-2055 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2015-2055 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-2055?: CVE-2015-2055 affects Zhone Technologies Gpon 2520 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-2055?: 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-2015-2055 published?: CVE-2015-2055 was published on 2015-02-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:zhone_technologies:gpon_2520_firmware:r4.0.2.566b:*:*:*:*:*:*:*

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