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CVE-2020-11491

25
FAUCET Score

CVE-2020-11491 describes an absolute path traversal vulnerability in Zen Load Balancer version 3.10.1, specifically within the Monitoring::Logs functionality. This flaw allows remote authenticated administrators to read arbitrary system files, such as /etc/shadow, by manipulating the 'filelog' parameter in requests to index.cgi. Rated as MEDIUM severity (CVSS 4.9), the attack requires high privileges (PR:H) but has low attack complexity (AC:L) and can lead to high confidentiality impact (C:H) by exposing sensitive data. While not on CISA's KEV catalog, a Metasploit module exists for this vulnerability, indicating readily available exploit code, though there is minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
3.10.1CPE matchmatch criteria
cpe:2.3:a:zevenet:zen_load_balancer:3.10.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
7.87%
Probability of exploitation in next 30 days
EPSS Percentile
94.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Metasploit: Zen Load Balancer Directory Traversal · Apr 10, 2020
This CVE's current EPSS score of 0.0787 is in the 98th percentile among its peer group of 3,561 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, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

code610.blogspot.com / 2020/03/pentesting-zen-load-balancer-quick.html
ExploitThird Party Advisory
github.com / c610/tmp/blob/master/zenload4patreons.zip
ExploitThird Party Advisory