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HIGH severity

CVE-2019-18817 — istio

HIGHFix: istio/istio@7570a1f

CVE-2019-18817 is a high-severity (CVSS 7.5) CWE-835 vulnerability in istio.io/istio. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for istio.io/istio — see the affected versions and patch details below.

Istio vulnerable to denial of service

Also known asGHSA-vc7h-cmp3-4hw5
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs69th percentile — riskier than 69% of all scored CVEsHighest risk
0.04%0.60%1.15%1.71%0.5%1.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐹istio.io/istio

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Istio 1.3.x before 1.3.5 is vulnerable to denial of service because continue_on_listener_filters_timeout is set to True, a related issue to CVE-2019-18836.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Goistio.io/istio≥ 1.3.0&&< 1.3.51.3.5go get istio.io/istio@v1.3.5

Affected Products

1 product · 1 configurations
Application
istioistio
≥ 1.3 && < 1.3.5
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Istio 1.3.x before 1.3.5 allows Denial of Service because continue_on_li…

github.comNVDNov 2019

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for istio.io/istio, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update istio.io/istio to 1.3.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-18817 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

Istio 1.3.x before 1.3.5 is vulnerable to denial of service because `continue_on_listener_filters_timeout` is set to True, a related issue to CVE-2019-18836.
O3 Security · Impact-Aware SCA

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CVE-2019-18817: istio DoS — Fixed in 1.3.5