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CVE-2016-9955

17
FAUCET Score

CVE-2016-9955 describes a vulnerability in SimpleSAMLphp before version 1.14.11, specifically within the SimpleSAML_XML_Validator class constructor, affecting Debian and SimpleSAMLphp installations. This flaw could allow remote attackers to spoof signatures on SAML 1 responses or potentially cause a denial of service through excessive memory consumption due to improper boolean conversion. The vulnerability has a CVSS v3 score of 6.3 (MEDIUM), indicating a local attack vector with high complexity, requiring user interaction, and potentially leading to high impact on integrity and availability. There is 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
< 1.14.11CPE matchmatch criteria
cpe:2.3:a:simplesamlphp:simplesamlphp:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.3MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.0
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.19%
Probability of exploitation in next 30 days
EPSS Percentile
64.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0119 is in the 88th percentile among its peer group of 165 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 0.0 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

Patch Available

Vendor Patches (1)

composerpatch availablevia ghsa
Product: simplesamlphp/simplesamlphpFixed in: 1.14.11

Vendor Advisories (1)

composerGHSA-p9cm-r7jg-8q3gmedium

Incorrect signature verification in SimpleSAMLphp

Jan 24, 2020

References

lists.debian.org / debian-lts-announce/2018/03/msg00001.html
Third Party Advisory
simplesamlphp.org / security/201612-02
Vendor Advisory
securityfocus.com / bid/94946
Third Party AdvisoryVDB Entry