How severe is CVE-2017-8399?

CVE-2017-8399 has a CVSS 3.x base score of 9.8, 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 high, and availability high.

Is CVE-2017-8399 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-8399?

CVE-2017-8399 affects Pcre Pcre2. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-8399?

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-2017-8399 published?

CVE-2017-8399 was published on 2017-05-01 and last updated on 2026-06-17.

CVE-2017-8399

CVE-2017-8399 is a critical-severity vulnerability in Pcre Pcre2 with a CVSS 3.x base score of 9.8. 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-119.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Pcre Pcre2
Published: 2017-05-01
Last modified: 2026-06-17

Description

PCRE2 before 10.30 has an out-of-bounds write caused by a stack-based buffer overflow in pcre2_match.c, related to a "pattern with very many captures."

Frequently asked questions

What is CVE-2017-8399?: PCRE2 before 10.30 has an out-of-bounds write caused by a stack-based buffer overflow in pcre2_match.c, related to a "pattern with very many captures."
How severe is CVE-2017-8399?: CVE-2017-8399 has a CVSS 3.x base score of 9.8, 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 high, and availability high.
Is CVE-2017-8399 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-8399?: CVE-2017-8399 affects Pcre Pcre2. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-8399?: 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-2017-8399 published?: CVE-2017-8399 was published on 2017-05-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:pcre:pcre2:*:*:*:*:*:*:*:*

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CVE-2017-8786 — Critical (CVSS 9.8): pcre2test.c in PCRE2 10.23 allows remote attackers to cause a denial of service (heap-based buffer overflow) or…
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