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CVE-2025-62409

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:9ba3aa283144830658b664a40d2037df2d9577f4df77db51a3261825c0ea9832
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"envoy","vendor":"envoyproxy","versions":[{"status":"affected","version":">= 1.36.0, < 1.36.1"},{"status":"affected","version":">= 1.35.0, < 1.35.5"},{"status":"affected","version":">= 1.34.0, < 1.34.9"},{"status":"affected","version":"< 1.33.10"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c5af42a5e4e466c56b65a4afe359bf81a8d5cf4891dfe6d726151b94f4516f30 · sha256:130b4a05445b9de6… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.6,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c5af42a5e4e466c56b65a4afe359bf81a8d5cf4891dfe6d726151b94f4516f30 · sha256:130b4a05445b9de6… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-476","description":"CWE-476: NULL Pointer Dereference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c5af42a5e4e466c56b65a4afe359bf81a8d5cf4891dfe6d726151b94f4516f30 · sha256:130b4a05445b9de6… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-pq33-4jxh-hgm3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c5af42a5e4e466c56b65a4afe359bf81a8d5cf4891dfe6d726151b94f4516f30 · sha256:130b4a05445b9de6… · /containers/adp/0/references/0
{"name":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-pq33-4jxh-hgm3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-pq33-4jxh-hgm3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c5af42a5e4e466c56b65a4afe359bf81a8d5cf4891dfe6d726151b94f4516f30 · sha256:130b4a05445b9de6… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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