Is CVE-2017-12871 in the CISA KEV catalog?

No. CVE-2017-12871 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-12871?

CVE-2017-12871 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2017-12871?

CVE-2017-12871 has an EPSS score of 0.49% (38th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-12871?

Upgrade simplesamlphp on debian 11 to 1.14.15-1 or later.

CVE & CISA-KEV Catalog

CVE-2017-12871

MEDIUM

5.9

CVSS v3

NVD

Description

The aesEncrypt method in lib/SimpleSAML/Utils/Crypto.php in SimpleSAMLphp 1.14.x through 1.14.11 makes it easier for context-dependent attackers to bypass the encryption protection mechanism by leveraging use of the first 16 bytes of the secret key as the initialization vector (IV).

CWE-326

How to fix

Remediation Available

simplesamlphpDebian

Fixed in:1.14.15-1CVE-2017-12871

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.49%probability of exploitation in 30 days

38thpercentile

Low risk: more likely to be exploited than 38% of all known CVEs.

References

Patch2

Related Vulnerabilities

Other CWE-326 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0224	High	7.4	95%	-	Fix
CVE-2017-1000486	Critical	9.8	94%	KEV	Fix
CVE-2013-2566	Medium	5.9	84%	-	Fix
CVE-2017-11317	Critical	9.8	83%	KEV	-
CVE-2018-18325	High	7.5	74%	KEV	-
CVE-2018-15811	High	7.5	74%	KEV	-

Embed a live status badge for CVE-2017-12871

Markdown

[![CVE-2017-12871](https://tridentstack.com/cve/badge/CVE-2017-12871.svg)](https://tridentstack.com/cve/CVE-2017-12871)

HTML

<a href="https://tridentstack.com/cve/CVE-2017-12871"><img src="https://tridentstack.com/cve/badge/CVE-2017-12871.svg" alt="CVE-2017-12871"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.