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CVE-2017-1000071

24
FAUCET Score

CVE-2017-1000071 describes an authentication bypass vulnerability in Jasig phpCAS version 1.3.4, specifically within the validateCAS20 function, when it's configured to authenticate against an older CAS server. This high-severity flaw (CVSS 8.1) allows unauthenticated attackers to bypass authentication with high impact on confidentiality, integrity, and availability, though it requires high attack complexity. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.3.4CPE matchmatch criteria
cpe:2.3:a:apereo:phpcas:1.3.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.1HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.56%
Probability of exploitation in next 30 days
EPSS Percentile
88.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0356 is in the 48th percentile among its peer group of 8,914 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 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

github.com / Jasig/phpCAS/blob/master/docs/ChangeLog
Third Party Advisory
github.com / Jasig/phpCAS/issues/228
Third Party Advisory
securityfocus.com / bid/99609
Third Party AdvisoryVDB Entry