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CVE-2026-55490

OpenWrt is a Linux operating system targeting embedded devices. Before v25.12.5, an integer underflow in handle_send_a() of the Emergency Access Daemon allows any unauthenticated attacker on the local network to crash the daemon by sending a single crafted UDP packet. The message length underflows before a bounds check and is then passed to memcpy as a very large size. This issue is fixed v25.12.5.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:765ed712abac063d9094c9a16164baded1d84f086a018b7ee67ff1e8f22f1ed2
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"openwrt","vendor":"openwrt","versions":[{"status":"affected","version":"< 25.12.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f3d61c09459b80535379c6e1d8e2f5d090c3262691906ab14add443e19ed8a19 · sha256:4e02f30679ea8b66… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/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:f3d61c09459b80535379c6e1d8e2f5d090c3262691906ab14add443e19ed8a19 · sha256:4e02f30679ea8b66… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-191","description":"CWE-191: Integer Underflow (Wrap or Wraparound)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f3d61c09459b80535379c6e1d8e2f5d090c3262691906ab14add443e19ed8a19 · sha256:4e02f30679ea8b66… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/openwrt/openwrt/commit/63c0767f3d02f7b10b0f0b5293366bd059a08ca5","tags":["x_refsource_MISC"],"url":"https://github.com/openwrt/openwrt/commit/63c0767f3d02f7b10b0f0b5293366bd059a08ca5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f3d61c09459b80535379c6e1d8e2f5d090c3262691906ab14add443e19ed8a19 · sha256:4e02f30679ea8b66… · /containers/cna/references/1
{"name":"https://github.com/openwrt/openwrt/releases/tag/v25.12.5","tags":["x_refsource_MISC"],"url":"https://github.com/openwrt/openwrt/releases/tag/v25.12.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f3d61c09459b80535379c6e1d8e2f5d090c3262691906ab14add443e19ed8a19 · sha256:4e02f30679ea8b66… · /containers/cna/references/2
{"name":"https://github.com/openwrt/openwrt/security/advisories/GHSA-9558-77jp-g3fw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/openwrt/openwrt/security/advisories/GHSA-9558-77jp-g3fw"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f3d61c09459b80535379c6e1d8e2f5d090c3262691906ab14add443e19ed8a19 · sha256:4e02f30679ea8b66… · /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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