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CVE-1999-0740

Status: ModifiedMedium (6.4)—
Severity6.4Medium · CVSS 2.0
Exploitation probability2.05 %higher than 81% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

Remote attackers can cause a denial of service on Linux in.telnetd telnet daemon through a malformed TERM environmental variable.

CVSS

Base score
6.4
Version
2.0
Vector
AV:N/AC:L/Au:N/C:P/I:N/A:P

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
2.05 %
Percentile among all scored CVEs
81
Score date
10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Redhat — Linux

CWEs

References

Show 2 references

Raw JSON (NVD)

Show
{
  "id": "CVE-1999-0740",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "1999-08-19T04:00:00.000",
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/594",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/594",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Remote attackers can cause a denial of service on Linux in.telnetd telnet daemon through a malformed TERM environmental variable."
    }
  ],
  "lastModified": "2026-06-16T21:48:57.517",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:redhat:linux:4.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F299301C-6BFC-436C-9CFD-2E291D3702AE"
            },
            {
              "criteria": "cpe:2.3:o:redhat:linux:5.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A8EED385-8C39-4A40-A507-2EFE7652FB35"
            },
            {
              "criteria": "cpe:2.3:o:redhat:linux:6.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2DFA94D5-0139-490C-8257-0751FE9FBAE4"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}