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CVE-2015-2055

30
FAUCET Score

CVE-2015-2055 describes a denial-of-service vulnerability in Zhone GPON 2520 devices running firmware R4.0.2.566b, where a remote attacker can crash the device by submitting an excessively long string to the 'oldpassword' parameter. This vulnerability carries a high CVSS score of 7.8, indicating a critical impact with complete availability loss, and can be exploited remotely without authentication. While there is no evidence of active exploitation or widespread community discussion, a proof-of-concept exploit is publicly available on ExploitDB.

Impacted Technologies

VendorProductVersion(s)CPE
r4.0.2.566bCPE matchmatch criteria
cpe:2.3:o:zhone_technologies:gpon_2520_firmware:r4.0.2.566b:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.8HIGH

AV:N/AC:L/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.03%
Probability of exploitation in next 30 days
EPSS Percentile
86.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
ExploitDB: EDB-35859 · Jan 21, 2015
This CVE's current EPSS score of 0.0303 is in the 75th percentile among its peer group of 51,466 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

exploit-db.com / exploits/35859
Exploit
securityfocus.com / bid/74876