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01 Record

CVE-2023-35945

Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec

HighPUBLISHEDCNA: GitHub_M
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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02 Description

Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.65% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 76.1% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-10-15.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2023-07-13 20:41Z3 YR AGO
Last updated
2026-10-14 23:34Z15 DAYS AGO
Reserved
2023-06-20
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
  • CWE-400Uncontrolled Resource ConsumptionClass
  • CWE-459Incomplete CleanupBase
Data version
5.2
Document digest
23cc1ece18b4f8b7be764117c47ac460c79747efc087f43f87686a5021232d85

05 Affected products

VendorProductVersionsPlatforms
envoyproxyenvoy>= 1.26.0, < 1.26.3, >= 1.25.0, < 1.25.8, >= 1.24.0, < 1.24.9, >= 1.23.0, < 1.23.11—

06 References