CVE-2020-21055

FAUCET Score

CVE-2020-21055 describes a Directory Traversal vulnerability in FusionPBX version 4.5.7, allowing authenticated attackers to rename arbitrary files on the system. This medium-severity vulnerability (CVSS 6.5) has a low attack complexity and can lead to high integrity impact, as it permits unauthorized file modification. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		4.5.7CPE matchmatch criteria	cpe:2.3:a:fusionpbx:fusionpbx:4.5.7:::::::*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

Exploitability Score

2.8

Impact Score

3.6

CvssVersion

3.1

Exploit Intelligence

EPSS Score

1.18%

Probability of exploitation in next 30 days

EPSS Percentile

64.4%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0118 is in the 78th percentile among its peer group of 21,974 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference

View patch

References

github.com / fusionpbx/fusionpbx/commit/1a88ca61a744914d3336cc15a40fb3edbcde9085

PatchThird Party Advisory

resp3ctblog.wordpress.com / 2019/10/28/fusionpbx-path-traversal-6

Third Party Advisory