CVE Explorer

CVE-2025-66199

Issue summary: A TLS 1.3 connection using certificate compression can be forced to allocate a large buffer before decompression without checking against the configured certificate size limit. Impact summary: An attacker can cause per-connection memory allocations of up to approximately 22 MiB and extra CPU work, potentially leading to service degradation or resource exhaustion (Denial of Service). In affected configurations, the peer-supplied uncompressed certificate length from a CompressedCe

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8063ee4aa5157b2baa418cff3e30541fc99a200878a808b2d93d41761ef07490

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","product":"OpenSSL","vendor":"OpenSSL","versions":[{"lessThan":"3.6.1","status":"affected","version":"3.6.0","versionType":"semver"},{"lessThan":"3.5.5","status":"affected","version":"3.5.0","versionType":"semver"},{"lessThan":"3.4.4","status":"affected","version":"3.4.0","versionType":"semver"},{"lessThan":"3.3.6","status":"affected","version":"3.3.0","versionType":"semver"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:eb47a56ec780ff1ecbcca04814d30f5017635efc8d4337bae5eab9dff34c5da5 · sha256:1690ae3727d50dfc… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:eb47a56ec780ff1ecbcca04814d30f5017635efc8d4337bae5eab9dff34c5da5 · sha256:1690ae3727d50dfc… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-789","description":"CWE-789 Memory Allocation with Excessive Size Value","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:eb47a56ec780ff1ecbcca04814d30f5017635efc8d4337bae5eab9dff34c5da5 · sha256:1690ae3727d50dfc… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions

{"name":"3.3.6 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/3ed1f75249932b155eef993a8e66a99cb98bfef4"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:eb47a56ec780ff1ecbcca04814d30f5017635efc8d4337bae5eab9dff34c5da5 · sha256:1690ae3727d50dfc… · /containers/cna/references/4

{"name":"3.6.1 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/6184a4fb08ee6d7bca570d931a4e8bef40b64451"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:eb47a56ec780ff1ecbcca04814d30f5017635efc8d4337bae5eab9dff34c5da5 · sha256:1690ae3727d50dfc… · /containers/cna/references/1

{"name":"3.5.5 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/895150b5e021d16b52fb32b97e1dd12f20448be5"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:eb47a56ec780ff1ecbcca04814d30f5017635efc8d4337bae5eab9dff34c5da5 · sha256:1690ae3727d50dfc… · /containers/cna/references/2

{"name":"3.4.4 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/966a2478046c311ed7dae50c457d0db4cafbf7e4"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:eb47a56ec780ff1ecbcca04814d30f5017635efc8d4337bae5eab9dff34c5da5 · sha256:1690ae3727d50dfc… · /containers/cna/references/3

{"name":"OpenSSL Advisory","tags":["vendor-advisory"],"url":"https://openssl-library.org/news/secadv/20260127.txt"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:eb47a56ec780ff1ecbcca04814d30f5017635efc8d4337bae5eab9dff34c5da5 · sha256:1690ae3727d50dfc… · /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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