How severe is CVE-2019-17502?

CVE-2019-17502 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-17502 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-17502?

CVE-2019-17502 affects Hydra Project Hydra. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-17502?

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

When was CVE-2019-17502 published?

CVE-2019-17502 was published on 2019-10-12 and last updated on 2026-06-17.

CVE-2019-17502

CVE-2019-17502 is a high-severity vulnerability in Hydra Project Hydra with a CVSS 3.x base score of 7.5. 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Hydra Project Hydra
Published: 2019-10-12
Last modified: 2026-06-17

Description

Hydra through 0.1.8 has a NULL pointer dereference and daemon crash when processing POST requests that lack a Content-Length header. read.c, request.c, and util.c contribute to this. The process_header_end() function calls boa_atoi(), which ultimately calls atoi() on a NULL pointer.

Frequently asked questions

What is CVE-2019-17502?: Hydra through 0.1.8 has a NULL pointer dereference and daemon crash when processing POST requests that lack a Content-Length header. read.c, request.c, and util.c contribute to this. The process_header_end() function calls boa_atoi(), which ultimately calls atoi() on a NULL pointer.
How severe is CVE-2019-17502?: CVE-2019-17502 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-17502 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-17502?: CVE-2019-17502 affects Hydra Project Hydra. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-17502?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-17502 published?: CVE-2019-17502 was published on 2019-10-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hydra_project:hydra:*:*:*:*:*:*:*:*

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