How severe is CVE-2017-12871?

CVE-2017-12871 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2017-12871 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-12871?

CVE-2017-12871 primarily affects Simplesamlphp. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-12871?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-12871 published?

CVE-2017-12871 was published on 2017-09-01 and last updated on 2026-06-17.

CVE-2017-12871

CVE-2017-12871 is a medium-severity vulnerability in Simplesamlphp with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-326.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-326
Affected product: Simplesamlphp
Published: 2017-09-01
Last modified: 2026-06-17

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).

Frequently asked questions

What is CVE-2017-12871?: 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).
How severe is CVE-2017-12871?: CVE-2017-12871 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2017-12871 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-12871?: CVE-2017-12871 primarily affects Simplesamlphp. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-12871?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-12871 published?: CVE-2017-12871 was published on 2017-09-01 and last updated on 2026-06-17.

References

Affected products (12)

cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.0:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.1:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.2:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.3:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.4:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.5:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.6:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.7:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.8:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.9:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.10:*:*:*:*:*:*:*
cpe:2.3:a:simplesamlphp:simplesamlphp:1.14.11:*:*:*:*:*:*:*

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