Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-6985

A weakness has been identified in Cesanta Mongoose up to 7.20. This vulnerability affects the function handle_opt of the file /src/net_builtin.c of the component TCP Option Handler. This manipulation of the argument optlen causes infinite loop. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 7.21 is able to resolve this issue. Upgrading the affected component is advised. VulDB has contacted t
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:557360cc1782f926121f1997e6d0095958524b9843cc47c8a56ae02713f84309
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":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"baseScore":5,"vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C","version":"2.0"},"metric_type":"cvssV2_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/metrics/3/cvssV2_0

{"metric":{"baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","version":"3.0"},"metric_type":"cvssV3_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/metrics/2/cvssV3_0
cwe · 2 assertions

{"cweId":"CWE-404","description":"Denial of Service","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-835","description":"Infinite Loop","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"cpes":["cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*"],"modules":["TCP Option Handler"],"product":"Mongoose","vendor":"Cesanta","versions":[{"status":"affected","version":"7.0"},{"status":"affected","version":"7.1"},{"status":"affected","version":"7.2"},{"status":"affected","version":"7.3"},{"status":"affected","version":"7.4"},{"status":"affected","version":"7.5"},{"status":"affected","version":"7.6"},{"status":"affected","version":"7.7"},{"status":"affected","version":"7.8"},{"status":"affected","version":"7.9"},{"status":"affected","version":"7.10"},{"status":"affected","version":"7.11"},{"…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/affected/0

Provider-owned CVSS observations

4 source assertions
{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"baseScore":5,"vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C","version":"2.0"},"metric_type":"cvssV2_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/metrics/3/cvssV2_0
{"metric":{"baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","version":"3.0"},"metric_type":"cvssV3_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/metrics/2/cvssV3_0

CWE assertions

2 source assertions
{"cweId":"CWE-404","description":"Denial of Service","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-835","description":"Infinite Loop","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["patch"],"url":"https://github.com/cesanta/mongoose/releases/tag/7.21"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/references/4
{"tags":["exploit"],"url":"https://github.com/dwBruijn/CVEs/blob/main/Mongoose/TCP_opt_dos.md"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/references/3
{"name":"Submit #796230 | Cesanta Mongoose 7.20 Denial of Service","tags":["third-party-advisory"],"url":"https://vuldb.com/submit/796230"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/references/2
{"name":"VDB-359528 | Cesanta Mongoose TCP Option net_builtin.c handle_opt infinite loop","tags":["vdb-entry","technical-description"],"url":"https://vuldb.com/vuln/359528"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/references/0
{"name":"VDB-359528 | CTI Indicators (IOB, IOC, TTP, IOA)","tags":["signature","permissions-required"],"url":"https://vuldb.com/vuln/359528/cti"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:74204b6f46c87f4b83cfbd256d5330d083a2b91df727a501c5e1d3fdd6b0238f · sha256:e7009c90b26936ff… · /containers/cna/references/1

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.

← Back to CVE Explorer