CVE-2020-8595
Istio 1.3 through 1.4.3 allows authentication bypass. The Authentication Policy exact-path...
Istio versions 1.2.10 (End of Life) and prior, 1.3 through 1.3.7, and 1.4 through 1.4.3 allows authentication bypass. The Authentication Policy exact-path matching logic can allow unauthorized access to HTTP paths even if they are configured to be only accessed after presenting a valid JWT token. For example, an attacker can add a ? or # character to a URI that would otherwise satisfy an exact-path match.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
NVD Score used
7.3
Istio versions 1.2.10 (End of Life) and prior, 1.3 through 1.3.7, and 1.4 through 1.4.3 allows authentication bypass. The Authentication Policy exact-path matching logic can allow unauthorized access to HTTP paths even if they are configured to be only accessed after presenting a valid JWT token. For example, an attacker can add a ? or # character to a URI that would otherwise satisfy an exact-path match.
- Record
CVE-2020-8595- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-287
- Updated
- 2026-11-02
CVE List No score
Istio versions 1.2.10 (End of Life) and prior, 1.3 through 1.3.7, and 1.4 through 1.4.3 allows authentication bypass. The Authentication Policy exact-path matching logic can allow unauthorized access to HTTP paths even if they are configured to be only accessed after presenting a valid JWT token. For example, an attacker can add a ? or # character to a URI that would otherwise satisfy an exact-path match.
- Record
CVE-2020-8595- Updated
- 2026-11-02
EUVDEUVD-2020-29443 No score
Istio versions 1.2.10 (End of Life) and prior, 1.3 through 1.3.7, and 1.4 through 1.4.3 allows authentication bypass. The Authentication Policy exact-path matching logic can allow unauthorized access to HTTP paths even if they are configured to be only accessed after presenting a valid JWT token. For example, an attacker can add a ? or # character to a URI that would otherwise satisfy an exact-path match.
- Record
EUVD-2020-29443- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-6mcc-fxc5-58cv No score
Istio 1.3 through 1.4.3 allows authentication bypass. The Authentication Policy exact-path...
Istio 1.3 through 1.4.3 allows authentication bypass. The Authentication Policy exact-path matching logic can allow unauthorized access to HTTP paths even if they are configured to be only accessed after presenting a valid JWT token. For example, an attacker can add a ? or # character to a URI that would otherwise satisfy an exact-path match.
- Record
GHSA-6mcc-fxc5-58cv- Updated
- 2026-11-02
OSV
7.3
Istio versions 1.2.10 (End of Life) and prior, 1.3 through 1.3.7, and 1.4 through 1.4.3 allows authentication bypass. The Authentication Policy exact-path matching logic can allow unauthorized access to HTTP paths even if they are configured to be only accessed after presenting a valid JWT token. For example, an attacker can add a ? or # character to a URI that would otherwise satisfy an exact-path match.
- Record
CVE-2020-8595- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - Updated
- 2026-11-02
OSVRHSA-2020:0477
7.3
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.0.7 servicemesh-proxy security update
- Record
RHSA-2020:0477- CVSS 3.1
- 7.3 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
servicemesh-proxyRed Hat:service_mesh:1.0::el8 |
before 0:1.0.7-1.el8 | 0:1.0.7-1.el8 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-8595 is a high vulnerability (CVSS 7.3) in Istio, published February 12, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.63%, the 85th percentile. Fixed in servicemesh-proxy 0:1.0.7-1.el8.
References
github.com/istio/istio/commits/master
istio.io/news/security
access.redhat.com/errata/RHSA-2020:0477
access.redhat.com/security/cve/cve-2020-8595
istio.io/news/security/istio-security-2020-001
bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-8595
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nvd.nist.gov/vuln/detail/CVE-2020-8595
github.com/advisories/GHSA-6mcc-fxc5-58cv
access.redhat.com/security/updates/classification
bugzilla.redhat.com/show_bug.cgi?id=1798247
security.access.redhat.com/data/csaf/v2/advisories/2020/rhsa-2020_0477.json
access.redhat.com/security/cve/CVE-2020-8595
cve.org/CVERecord?id=CVE-2020-8595