7.5

CVE-2025-62409: envoyproxy envoy NULL Pointer Dereference

CVSS: 7.5v3.1HighAnalyzed
Published 16-10-2025Last modified 16-10-2025
Open JSON

Vulnerability summary

CVE-2025-62409 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in envoyproxy envoy. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 38.2% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.46%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2025:15655-1

Timeline

  1. 16-10-2025
    PublishedVulnerability first disclosed.
  2. 16-10-2025
    Last modifiedVulnerability information updated.

Description

Envoy is a cloud-native, open source edge and service proxy. Prior to 1.36.1, 1.35.5, 1.34.9, and 1.33.10, large requests and responses can potentially trigger TCP connection pool crashes due to flow control management in Envoy. It will happen when the connection is closing but upstream data is still coming, resulting in a buffer watermark callback nullptr reference. The vulnerability impacts TCP proxy and HTTP 1 & 2 mixed use cases based on ALPN. This vulnerability is fixed in 1.36.1, 1.35.5, 1.34.9, and 1.33.10.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

0.00 pp

From 0.46% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.46%

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
  • envoyEOL≥ 1.36.0, < 1.36.1 | < 1.33.10 | < 1.33.11 | ≥ 1.34.0, < 1.34.9 | ≥ 1.35.0, < 1.35.5 | 1.36.0

1 vendor · 1 product

References

1 links