How severe is CVE-2019-11636?

CVE-2019-11636 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-2019-11636 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-11636?

CVE-2019-11636 primarily affects Z.cash Zcash. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-11636?

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-2019-11636 published?

CVE-2019-11636 was published on 2019-05-01 and last updated on 2026-06-17.

CVE-2019-11636

CVE-2019-11636 is a high-severity vulnerability in Z.cash Zcash 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-254.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-254
Affected product: Z.cash Zcash
Published: 2019-05-01
Last modified: 2026-06-17

Description

Zcash 2.x allows an inexpensive approach to "fill all transactions of all blocks" and "prevent any real transaction from occurring" via a "Sapling Wood-Chipper" attack.

Frequently asked questions

What is CVE-2019-11636?: Zcash 2.x allows an inexpensive approach to "fill all transactions of all blocks" and "prevent any real transaction from occurring" via a "Sapling Wood-Chipper" attack.
How severe is CVE-2019-11636?: CVE-2019-11636 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-2019-11636 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-11636?: CVE-2019-11636 primarily affects Z.cash Zcash. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-11636?: 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-2019-11636 published?: CVE-2019-11636 was published on 2019-05-01 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:z.cash:zcash:*:*:*:*:*:*:*:*
cpe:2.3:a:z.cash:zcash:2.0.5:rc1:*:*:*:*:*:*

More vulnerabilities in Z.cash Zcash

CVE-2019-7167 — High (CVSS 7.5): Zcash, before the Sapling network upgrade (2018-10-28), had a counterfeiting vulnerability. A key-generation process,…
CVE-2019-16930 — Medium (CVSS 5.3): Zcashd in Zcash before 2.0.7-3 allows discovery of the IP address of a full node that owns a shielded address, related…

All CVEs affecting Z.cash Zcash →

Other CWE-254 vulnerabilities

CVE-2016-5788 — Critical (CVSS 10.0): General Electric (GE) Bently Nevada 3500/22M USB with firmware before 5.0 and Bently Nevada 3500/22M Serial have open…
CVE-2015-3972 — Critical (CVSS 10.0): The web interface on Janitza UMG 508, 509, 511, 604, and 605 devices supports only short PIN values for authentication,…
CVE-2015-1158 — Critical (CVSS 10.0): The add_job function in scheduler/ipp.c in cupsd in CUPS before 2.0.3 performs incorrect free operations for…
CVE-2019-15149 — Critical (CVSS 9.8): core.py in Mitogen before 0.2.8 has a typo that drops the unidirectional-routing protection mechanism in the case of a…
CVE-2017-8227 — Critical (CVSS 9.8): Amcrest IPM-721S V2.420.AC00.16.R.20160909 devices have a timeout policy to wait for 5 minutes in case 30 incorrect…
CVE-2016-9568 — Critical (CVSS 9.8): A security design issue can allow an unprivileged user to interact with the Carbon Black Sensor and perform…

Browse all CWE-254 vulnerabilities →