CVE Explorer
CVE-2026-20004
A vulnerability in the TLS library of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust the available memory of an affected device.
This vulnerability is due to improper management of memory resources during TLS connection setup. An attacker could exploit this vulnerability by repeatedly triggering the conditions that cause the memory increase. This could be done in a variety of ways, such as by repeatedly attempting Extensible Authentication Protocol (EAP) au
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"Cisco IOS XE Software","vendor":"Cisco","versions":[{"status":"affected","version":"16.9.1"},{"status":"affected","version":"16.9.2"},{"status":"affected","version":"16.9.1a"},{"status":"affected","version":"16.9.1b"},{"status":"affected","version":"16.9.1s"},{"status":"affected","version":"16.9.3"},{"status":"affected","version":"16.9.4"},{"status":"affected","version":"16.9.3a"},{"status":"affected","version":"16.9.5"},{"status":"affected","version":"16.9.5f"},{"status":"affected","version":"16.9.6"},{"status":"affected","version":"16.9.7"},{"status":"affected","version":"16.9.8"…
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:b38c063c4201de2d16a9d2716d4ea7856283694373a8bb9bfa9b856bf11eb2e8 · sha256:7137d1c61c19543b… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:b38c063c4201de2d16a9d2716d4ea7856283694373a8bb9bfa9b856bf11eb2e8 · sha256:7137d1c61c19543b… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-771","description":"Missing Reference to Active Allocated Resource","lang":"en","type":"cwe"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:b38c063c4201de2d16a9d2716d4ea7856283694373a8bb9bfa9b856bf11eb2e8 · sha256:7137d1c61c19543b… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"cisco-sa-iosxe-tls-dos-TVgLDEZL","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-tls-dos-TVgLDEZL"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b38c063c4201de2d16a9d2716d4ea7856283694373a8bb9bfa9b856bf11eb2e8 · sha256:7137d1c61c19543b… · /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.