How severe is CVE-2019-15699?

CVE-2019-15699 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2019-15699 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-15699?

CVE-2019-15699 affects Suricata-ids Suricata. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-15699?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-15699 published?

CVE-2019-15699 was published on 2019-09-24 and last updated on 2026-06-17.

CVE-2019-15699

CVE-2019-15699 is a critical-severity vulnerability in Suricata-ids Suricata with a CVSS 3.x base score of 9.1. 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-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Suricata-ids Suricata
Published: 2019-09-24
Last modified: 2026-06-17

Description

An issue was discovered in app-layer-ssl.c in Suricata 4.1.4. Upon receiving a corrupted SSLv3 (TLS 1.2) packet, the parser function TLSDecodeHSHelloExtensions tries to access a memory region that is not allocated, because the expected length of HSHelloExtensions does not match the real length of the HSHelloExtensions part of the packet.

Frequently asked questions

What is CVE-2019-15699?: An issue was discovered in app-layer-ssl.c in Suricata 4.1.4. Upon receiving a corrupted SSLv3 (TLS 1.2) packet, the parser function TLSDecodeHSHelloExtensions tries to access a memory region that is not allocated, because the expected length of HSHelloExtensions does not match the real length of the HSHelloExtensions part of the packet.
How severe is CVE-2019-15699?: CVE-2019-15699 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2019-15699 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-15699?: CVE-2019-15699 affects Suricata-ids Suricata. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-15699?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-15699 published?: CVE-2019-15699 was published on 2019-09-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:suricata-ids:suricata:4.1.4:*:*:*:*:*:*:*

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