KEV Entry

CVE-2021-27137

Known Exploited Vulnerability Entry Previdian

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Entry Details
Confirmed Exploited

CVE-2021-27137

2026-07-21 14:00 CEST

Timestamps

2026-07-21

2026-07-21

Scope

An issue was discovered in router/upnp/src/ssdp.c in DD-WRT before 45724. An unsafe strcpy in the UPnP handling functionality allows an... | Affected: DD-WRT / DD-WRT | CVSS: 8.1 (HIGH) | EPSS: 0.03995 | Used in malware: unknown | Listed 3 hours ahead of CISA KEV | Not yet in CISA KEV: False

References
  • {'id': 'CVE-2021-27137', 'url': 'https://www.cve.org/CVERecord?id=CVE-2021-27137'}
  • {'id': 'previdian', 'url': 'https://previdian.com/CVE-2021-27137'}

969719ef-0ea0-4e9b-b485-971d9c9ceec8

Previdian
caeb2787-0d58-4236-9039-7c86c3e566f3

2026-10-02 09:09 CEST

2026-10-02 09:09 CEST

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report previdian successful_exploitation 0.70
View details 
{
  "added_date": "2026-07-21T12:00:00.000Z",
  "ahead_of_cisa_kev": {
    "count": 3,
    "unit": "hour"
  },
  "cve_id": "CVE-2021-27137",
  "cvss_estimated": false,
  "cvss_score": 8.1,
  "cvss_severity": "HIGH",
  "epss_percentile": 0.902,
  "epss_score": 0.03995,
  "feed": "Previdian (previdian.com)",
  "ghsa_id": null,
  "not_yet_in_cisa_kev": false,
  "previous_ids": [],
  "product": "DD-WRT",
  "title": "An issue was discovered in router/upnp/src/ssdp.c in DD-WRT before 45724. An unsafe strcpy in the UPnP handling functionality allows an...",
  "used_in_malware": "unknown",
  "vendor": "DD-WRT",
  "virtual_patch": false,
  "vulnerability_id": "CVE-2021-27137"
}
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