Is CVE-2019-8955 in the CISA KEV catalog?

No. CVE-2019-8955 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-8955?

CVE-2019-8955 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2019-8955?

CVE-2019-8955 has an EPSS score of 4.57% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-8955?

Upgrade tor on debian 11 to 0.3.5.8-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2019-8955

HIGHEPSS 91th pctl

7.5

CVSS v3

NVD

Description

In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

torDebian

Fixed in:0.3.5.8-1CVE-2019-8955

torUbuntu

Fixed in:0.2.4.27-1ubuntu0.1+esm2USN-5036-1

Fixed in:0.2.9.14-1ubuntu1~16.04.3+esm1USN-5036-1

Fixed in:0.3.2.10-1ubuntu0.2~esm2USN-5036-1

Fixed in:0.4.2.7-1ubuntu0.1~esm1USN-5036-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

4.57%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory1

securityfocus.com

Other references1

lists.opensuse.org

Related Vulnerabilities

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-50387	High	7.5	100%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2019-11479	High	7.5	92%	-	Fix
CVE-2024-27316	High	7.5	91%	-	Fix
CVE-2022-30522	High	7.5	90%	-	Fix
CVE-2019-9515	High	7.5	88%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.