Public proof of conceptFix available

CVE-2021-34824

Q: Is CVE-2021-34824 actively exploited?

Active exploitation of CVE-2021-34824 has not been confirmed. Its EPSS score was 2.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-34824?

CVE-2021-34824 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2021-06-29
Fixed in1.10.2 · 1.9.6

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Istio (1.8.x, 1.9.0-1.9.5 and 1.10.0-1.10.1) contains a remotely exploitable vulnerability where credentials specified in the Gateway and DestinationRule credentialName field can be accessed from different namespaces.

Timeline

dates in UTC

2021-06-2914:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-34824?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-34824?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Istio

Branch	Affected	Fixed in	Source
1.10	≥ 1.10.0, < 1.10.2	1.10.2	NVD
1.x	≥ 1.8.0, < 1.9.6	1.9.6	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Istio to 1.10.2 · 1.9.6

Advisories and patches

github.comRelease Notes
istio.ioVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedrsalmond/CVE-2021-34824

Sources

NVDCVSS 3.18.8read 2026-10-23
NVDCVSS 2.06.5read 2026-10-23
FIRST EPSSEPSS score2.0 %2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2021-06-29
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-34824?

Is CVE-2021-34824 actively exploited?

Active exploitation of CVE-2021-34824 has not been confirmed. Its EPSS score was 2.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-34824?

CVE-2021-34824 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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