7.5

CVE-2020-8595: istio Improper Authentication

CVSS: 7.5v2.0HighModified
AliasesRHSA-2020:0477
Published 12-02-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-8595 is a high (CVSS 7.5) Improper Authentication vulnerability in istio. EPSS estimates a 2.61% chance of exploitation in the next 30 days, higher than 85.1% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v2.0 (NVD)
EPSS score
2.61%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-02-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

2.61%

Chance of exploitation in the next 30 days

Percentile

85%

Versus all other CVEs

30-day change

0.00 pp

From 2.61% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.61%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat2 products
Istio1 product
  • istio≥ 1.3, ≤ 1.3.7 | ≥ 1.4.0, ≤ 1.4.3

2 vendors · 3 products

References

12 links
Show all 12 references