# CVE-2019-12243: Istio may not check inbound TCP connections against istio-policy

Source: https://junglewise.ai/threats/cve-2019-12243-istio-may-not-check-inbound-tcp-connections-against-istio-policy  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-02-15  
License: CC BY 4.0 with a link back

CVE-2019-12243 · Severity: low · CVSS 3.1 · Published 2022-02-15

Istio may not check inbound TCP connections against istio-policy

Technologies: [istio.io/istio (Go)](https://junglewise.ai/threats/technologies/istio-io-istio). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2019-12243 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2019-12243 being exploited in the wild.

**How severe is CVE-2019-12243?** Low severity, with a CVSS score of 3.1, published 15 February 2022.

**Which products and versions are affected?** istio.io/istio (Go) SEMVER:introduced=1.1.0,fixed=1.1.7.

**Is there a fix for CVE-2019-12243?** Yes. istio.io/istio (Go): upgrade to 1.1.7 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2019-12243?** Check whether you run istio.io/istio (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- istio.io/istio (Go): upgrade to 1.1.7 or later

  ```sh
  go get istio.io/istio@v1.1.7
  ```


## Affected products

- istio.io/istio (Go) SEMVER:introduced=1.1.0,fixed=1.1.7

## Identifiers

- CVE-2019-12243
- GHSA-6g5f-f5pm-mjrg

## Related threats

- [GO-2026-5363 - Istio: SSRF via RequestAuthentication jwksUri in istio.io/istio](https://junglewise.ai/threats/cve-2026-41413-istio-ssrf-via-requestauthentication-jwksuri)
- [Istio AuthorizationPolicy regex injection in serviceAccounts](https://junglewise.ai/threats/cve-2026-39350-istio-authorizationpolicy-regex-injection-in-serviceaccounts)
- [Ill-formed headers may lead to unexpected behavior in Istio](https://junglewise.ai/threats/cve-2022-31045-ill-formed-headers-may-lead-to-unexpected-behavior-in-istio)
- [Istio vulnerable to denial of service](https://junglewise.ai/threats/cve-2019-18817-istio-vulnerable-to-denial-of-service)
- [Istio Authorization Bypass Vulnerability](https://junglewise.ai/threats/cve-2021-31920-istio-authorization-bypass-vulnerability)