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CVE-2026-4861

A weakness has been identified in Wavlink WL-NU516U1 260227. This vulnerability affects the function ftext of the file /cgi-bin/nas.cgi. This manipulation of the argument Content-Length causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6798096da0255bbe688e87f07e2147a1460828817a5b56df5860103cd9781119
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 4 assertions

{"metric":{"baseScore":8.7,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P","version":"4.0"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R","version":"3.0"},"metric_type":"cvssV3_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/metrics/2/cvssV3_0

{"metric":{"baseScore":9,"vectorString":"AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR","version":"2.0"},"metric_type":"cvssV2_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/metrics/3/cvssV2_0
cwe · 2 assertions

{"cweId":"CWE-119","description":"Memory Corruption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-121","description":"Stack-based Buffer Overflow","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"cpes":["cpe:2.3:o:wavlink:wl-nu516u1_firmware:*:*:*:*:*:*:*:*"],"product":"WL-NU516U1","vendor":"Wavlink","versions":[{"status":"affected","version":"260227"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/affected/0

Provider-owned CVSS observations

4 source assertions
{"metric":{"baseScore":8.7,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P","version":"4.0"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R","version":"3.0"},"metric_type":"cvssV3_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/metrics/2/cvssV3_0
{"metric":{"baseScore":9,"vectorString":"AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR","version":"2.0"},"metric_type":"cvssV2_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/metrics/3/cvssV2_0

CWE assertions

2 source assertions
{"cweId":"CWE-119","description":"Memory Corruption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-121","description":"Stack-based Buffer Overflow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"tags":["exploit"],"url":"https://github.com/Wlz1112/WAVLINK-NU516U1-V260227/blob/main/Content-Length.md"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/references/3
{"name":"VDB-353192 | CTI Indicators (IOB, IOC, IOA)","tags":["signature","permissions-required"],"url":"https://vuldb.com/?ctiid.353192"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/references/1
{"name":"VDB-353192 | Wavlink WL-NU516U1 nas.cgi ftext stack-based overflow","tags":["vdb-entry","technical-description"],"url":"https://vuldb.com/?id.353192"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/references/0
{"name":"Submit #776217 | Wavlink NU516U1 V260227 Stack-based Buffer Overflow","tags":["third-party-advisory"],"url":"https://vuldb.com/?submit.776217"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ab074ac7ec86fa8ec8afb598727b79ec41a3b4ae3a133fbe0dc158388a332a1b · sha256:11ab44b514612f2f… · /containers/cna/references/2

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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