CVE-2020-10739

Name: CVE-2020-10739
Creator: NVD / NIST
Published: 2020-06-02T13:15:10.983+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.33%

Last modified Jun 17, 2026

CVE-2020-10739 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Istio 1.4.x before 1.4.9 and Istio 1.5.x before 1.5.4 contain the following vulnerability when telemetry v2 is enabled: by sending a specially crafted packet, an attacker could trigger a Null Pointer Exception resulting in a Denial of Service. This could be sent to the ingress gateway or a sidecar, triggering a null pointer exception which results in a denial of service. EPSS estimates a 2.33% chance of exploitation in the next 30 days.

Description

Istio 1.4.x before 1.4.9 and Istio 1.5.x before 1.5.4 contain the following vulnerability when telemetry v2 is enabled: by sending a specially crafted packet, an attacker could trigger a Null Pointer Exception resulting in a Denial of Service. This could be sent to the ingress gateway or a sidecar, triggering a null pointer exception which results in a denial of service. This also affects servicemesh-proxy where a null pointer exception flaw was found in servicemesh-proxy. When running Telemetry v2 (not on by default in version 1.4.x), an attacker could send a specially crafted packet to the ingress gateway or proxy sidecar, triggering a denial of service.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.33%

81.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Istio	Istio	>= 1.4.0, < 1.4.9
Istio	Istio	>= 1.5.0, < 1.5.4

References

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10739Broken Link, Issue Tracking, Third Party Advisory
https://github.com/istio/envoy/commit/8788a3cf255b647fd14e6b5e2585abaaedb28153#diff-fcf2cf5dd389b5285f882ba4a8708633Patch, Third Party Advisory
https://istio.io/news/security/istio-security-2020-005/Mitigation, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10739Broken Link, Issue Tracking, Third Party Advisory
https://github.com/istio/envoy/commit/8788a3cf255b647fd14e6b5e2585abaaedb28153#diff-fcf2cf5dd389b5285f882ba4a8708633Patch, Third Party Advisory
https://istio.io/news/security/istio-security-2020-005/Mitigation, Vendor Advisory

Timeline

Published: Jun 2, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-10739?

How severe is CVE-2020-10739?

CVE-2020-10739 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.33% probability of exploitation in the next 30 days.

How do I fix CVE-2020-10739?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-10739?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST