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CVE-2019-18817

24
FAUCET Score

CVE-2019-18817 is a Denial of Service vulnerability affecting Istio versions 1.3.x prior to 1.3.5, stemming from an incorrect configuration setting (continue_on_listener_filters_timeout set to True). It carries a CVSS v3.1 score of 7.5 (High), indicating it can be exploited remotely with low complexity, leading to a complete loss of availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.3, < 1.3.5CPE matchmatch criteria
cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.21%
Probability of exploitation in next 30 days
EPSS Percentile
65.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0121 is in the 44th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

gopatch availablevia ghsa
Product: istio.io/istioFixed in: 1.3.5

Vendor Advisories (2)

goGHSA-vc7h-cmp3-4hw5high

Istio vulnerable to denial of service

May 24, 2022
redhatCVE-2019-18817Important

istio/envoy: infinite loop in Envoy, and subsequently Istio leads to a DoS

Nov 11, 2019

References

github.com / istio/istio/issues/18229
ExploitThird Party Advisory
istio.io / news/2019/announcing-1.3.5
Vendor Advisory