7.8

CVE-2019-15226: envoyproxy envoy Uncontrolled Resource Consumption

CVSS: 7.8v2.0HighModified
Published 09-10-2019Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2019-15226 is a high (CVSS 7.8) Uncontrolled Resource Consumption vulnerability in envoyproxy envoy. EPSS estimates a 64.52% chance of exploitation in the next 30 days, higher than 99.2% of scored vulnerabilities.

Overall risk
44/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v2.0 (NVD)
EPSS score
64.52%
0%100%
Critical · -0.88 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-10-2019
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

Upon receiving each incoming request header data, Envoy will iterate over existing request headers to verify that the total size of the headers stays below a maximum limit. The implementation in versions 1.10.0 through 1.11.1 for HTTP/1.x traffic and all versions of Envoy for HTTP/2 traffic had O(n^2) performance characteristics. A remote attacker may craft a request that stays below the maximum request header size but consists of many thousands of small headers to consume CPU and result in a denial-of-service attack.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

64.52%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

-0.88 pp

From 65.39% on 21-09-2026

21-09-202621-10-2026
EPSS score
64.52%

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

Envoyproxy1 product
  • envoyEOL1.0.0 | 1.1.0 | 1.2.0 | 1.3.0 | 1.4.0 | 1.5.0 | 1.6.0 | 1.7.0 | 1.7.1 | 1.8.0 | 1.9.0 | 1.9.1 | 1.10.0 | 1.11.0 | 1.11.1 | 1.11.2

1 vendor · 1 product

References

3 links