CVE-2024-20266 (GCVE-0-2024-20266)
Vulnerability from cvelistv5 – Published: 2024-03-13 16:42 – Updated: 2024-08-14 15:00
VLAI
EPSS
VEX
Summary
A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition.
This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a crash of the dhcpd process. While the dhcpd process is restarting, which may take approximately two minutes, DHCPv4 server services are unavailable on the affected device. This could temporarily prevent network access to clients that join the network during that time period and rely on the DHCPv4 server of the affected device.
Notes:
Only the dhcpd process crashes and eventually restarts automatically. The router does not reload.
This vulnerability only applies to DHCPv4. DHCP version 6 (DHCPv6) is not affected.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco IOS XR Software |
Affected:
5.2.0
Affected: 5.2.1 Affected: 5.2.2 Affected: 5.2.4 Affected: 5.2.3 Affected: 5.2.5 Affected: 5.2.47 Affected: 5.3.0 Affected: 5.3.1 Affected: 5.3.2 Affected: 5.3.3 Affected: 5.3.4 Affected: 6.0.0 Affected: 6.0.1 Affected: 6.0.2 Affected: 6.1.1 Affected: 6.1.2 Affected: 6.1.3 Affected: 6.1.4 Affected: 6.1.12 Affected: 6.1.22 Affected: 6.1.32 Affected: 6.1.36 Affected: 6.1.42 Affected: 6.2.1 Affected: 6.2.2 Affected: 6.2.3 Affected: 6.2.25 Affected: 6.2.11 Affected: 6.3.2 Affected: 6.3.3 Affected: 6.3.15 Affected: 6.4.1 Affected: 6.4.2 Affected: 6.4.3 Affected: 6.5.1 Affected: 6.5.2 Affected: 6.5.3 Affected: 6.5.25 Affected: 6.5.26 Affected: 6.5.28 Affected: 6.5.29 Affected: 6.5.32 Affected: 6.5.33 Affected: 6.6.2 Affected: 6.6.3 Affected: 6.6.25 Affected: 6.6.4 Affected: 7.0.1 Affected: 7.0.2 Affected: 7.0.12 Affected: 7.0.14 Affected: 7.1.1 Affected: 7.1.15 Affected: 7.1.2 Affected: 7.1.3 Affected: 6.7.1 Affected: 6.7.2 Affected: 6.7.3 Affected: 6.7.4 Affected: 7.2.0 Affected: 7.2.1 Affected: 7.2.2 Affected: 7.3.1 Affected: 7.3.15 Affected: 7.3.2 Affected: 7.3.3 Affected: 7.3.5 Affected: 7.4.1 Affected: 7.4.2 Affected: 6.8.1 Affected: 6.8.2 Affected: 7.5.1 Affected: 7.5.3 Affected: 7.5.2 Affected: 7.5.4 Affected: 7.5.5 Affected: 7.6.1 Affected: 7.6.2 Affected: 7.7.1 Affected: 7.7.2 Affected: 7.7.21 Affected: 6.9.1 Affected: 6.9.2 Affected: 7.8.1 Affected: 7.8.2 Affected: 7.9.1 Affected: 7.9.2 Affected: 7.9.21 Affected: 7.10.1 Affected: 7.10.2 |
|
| cisco | ios_xr_software |
Affected:
5.2.0
Affected: 5.2.1 Affected: 5.2.2 Affected: 5.2.4 Affected: 5.2.3 Affected: 5.2.5 Affected: 5.2.47 Affected: 5.3.0 Affected: 5.3.1 Affected: 5.3.2 Affected: 5.3.3 Affected: 5.3.4 Affected: 6.0.0 Affected: 6.0.1 Affected: 6.0.2 Affected: 6.1.1 Affected: 6.1.2 Affected: 6.1.3 Affected: 6.1.4 Affected: 6.1.12 Affected: 6.1.22 Affected: 6.1.32 Affected: 6.1.36 Affected: 6.1.42 Affected: 6.2.1 Affected: 6.2.2 Affected: 6.2.3 Affected: 6.2.25 Affected: 6.2.11 Affected: 6.3.2 Affected: 6.3.3 Affected: 6.3.15 Affected: 6.4.1 Affected: 6.4.2 Affected: 6.4.3 Affected: 6.5.1 Affected: 6.5.2 Affected: 6.5.3 Affected: 6.5.25 Affected: 6.5.26 Affected: 6.5.28 Affected: 6.5.29 Affected: 6.5.32 Affected: 6.5.33 Affected: 6.6.2 Affected: 6.6.3 Affected: 6.6.25 Affected: 6.6.4 Affected: 7.0.1 Affected: 7.0.2 Affected: 7.0.12 Affected: 7.0.14 Affected: 7.1.1 Affected: 7.1.15 Affected: 7.1.2 Affected: 7.1.3 Affected: 6.7.1 Affected: 6.7.2 Affected: 6.7.3 Affected: 6.7.4 Affected: 7.2.0 Affected: 7.2.1 Affected: 7.2.2 Affected: 7.3.1 Affected: 7.3.15 Affected: 7.3.2 Affected: 7.3.3 Affected: 7.3.5 Affected: 7.4.1 Affected: 7.4.2 Affected: 6.8.1 Affected: 6.8.2 Affected: 7.5.1 Affected: 7.5.3 Affected: 7.5.2 Affected: 7.5.4 Affected: 7.5.5 Affected: 7.6.1 Affected: 7.6.2 Affected: 7.7.1 Affected: 7.7.2 Affected: 7.7.21 Affected: 6.9.1 Affected: 6.9.2 Affected: 7.8.1 Affected: 7.8.2 Affected: 7.9.1 Affected: 7.9.2 Affected: 7.9.21 Affected: 7.10.1 Affected: 7.10.2 cpe:2.3:o:cisco:ios_xr:5.2.0:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xr:5.2.1:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xr:5.2.2:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xr:5.2.4:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xr:5.2.3:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xr:5.2.5:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xr:5.2.47:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xr:5.3.0:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xr:5.3.1:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xr:5.3.2:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xr:5.3.3:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xr:5.3.4:*:*:*:*:*:*:* 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{
"containers": {
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{
"providerMetadata": {
"dateUpdated": "2024-08-01T21:52:31.683Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"name": "cisco-sa-iosxr-dhcp-dos-3tgPKRdm",
"tags": [
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],
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-dhcp-dos-3tgPKRdm"
}
],
"title": "CVE Program Container"
},
{
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"vendor": "cisco",
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This could temporarily prevent network access to clients that join the network during that time period and rely on the DHCPv4 server of the affected device.\\r\\n\\r Notes: \\r\\n\\r \\r Only the dhcpd process crashes and eventually restarts automatically. The router does not reload.\\r This vulnerability only applies to DHCPv4. DHCP version 6 (DHCPv6) is not affected.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad en la funci\u00f3n del servidor DHCP versi\u00f3n 4 (DHCPv4) del software Cisco IOS XR podr\u00eda permitir que un atacante remoto no autenticado desencadene una falla del proceso dhcpd, lo que resultar\u00eda en una condici\u00f3n de denegaci\u00f3n de servicio (DoS). Esta vulnerabilidad existe porque ciertos mensajes DHCPv4 se validan incorrectamente cuando son procesados por un dispositivo afectado. Un atacante podr\u00eda aprovechar esta vulnerabilidad enviando un mensaje DHCPv4 con formato incorrecto a un dispositivo afectado. Un exploit exitoso podr\u00eda permitir al atacante provocar una falla del proceso dhcpd. Mientras se reinicia el proceso dhcpd, lo que puede tardar aproximadamente dos minutos, los servicios del servidor DHCPv4 no est\u00e1n disponibles en el dispositivo afectado. Esto podr\u00eda impedir temporalmente el acceso a la red a los clientes que se unan a la red durante ese per\u00edodo de tiempo y dependan del servidor DHCPv4 del dispositivo afectado. Notas: S\u00f3lo el proceso dhcpd falla y finalmente se reinicia autom\u00e1ticamente. El enrutador no se recarga. Esta vulnerabilidad s\u00f3lo se aplica a DHCPv4. DHCP versi\u00f3n 6 (DHCPv6) no se ve afectado.\"}],\"affected\":[{\"source\":\"psirt@cisco.com\",\"affectedData\":[{\"vendor\":\"Cisco\",\"product\":\"Cisco IOS XR 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"redhat_vex": {
"current_release_date": "2025-05-28T21:59:48+00:00",
"cve": "CVE-2024-20266",
"id": "CVE-2024-20266",
"initial_release_date": "2024-01-01T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "CVE-2024-20266",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-20266.json",
"version": "3"
},
"vulnrichment": {
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\"affected\", \"version\": \"7.3.5\"}, {\"status\": \"affected\", \"version\": \"7.4.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2\"}, {\"status\": \"affected\", \"version\": \"6.8.1\"}, {\"status\": \"affected\", \"version\": \"6.8.2\"}, {\"status\": \"affected\", \"version\": \"7.5.1\"}, {\"status\": \"affected\", \"version\": \"7.5.3\"}, {\"status\": \"affected\", \"version\": \"7.5.2\"}, {\"status\": \"affected\", \"version\": \"7.5.4\"}, {\"status\": \"affected\", \"version\": \"7.5.5\"}, {\"status\": \"affected\", \"version\": \"7.6.1\"}, {\"status\": \"affected\", \"version\": \"7.6.2\"}, {\"status\": \"affected\", \"version\": \"7.7.1\"}, {\"status\": \"affected\", \"version\": \"7.7.2\"}, {\"status\": \"affected\", \"version\": \"7.7.21\"}, {\"status\": \"affected\", \"version\": \"6.9.1\"}, {\"status\": \"affected\", \"version\": \"6.9.2\"}, {\"status\": \"affected\", \"version\": \"7.8.1\"}, {\"status\": \"affected\", \"version\": \"7.8.2\"}, {\"status\": \"affected\", \"version\": \"7.9.1\"}, {\"status\": \"affected\", \"version\": \"7.9.2\"}, {\"status\": \"affected\", \"version\": \"7.9.21\"}, {\"status\": \"affected\", \"version\": \"7.10.1\"}, {\"status\": \"affected\", \"version\": \"7.10.2\"}], \"defaultStatus\": \"unknown\"}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-08-14T14:57:17.687Z\"}}], \"cna\": {\"source\": {\"defects\": [\"CSCwf83090\"], \"advisory\": \"cisco-sa-iosxr-dhcp-dos-3tgPKRdm\", \"discovery\": \"INTERNAL\"}, \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"Cisco\", \"product\": \"Cisco IOS XR Software\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.2.0\"}, {\"status\": \"affected\", \"version\": \"5.2.1\"}, {\"status\": \"affected\", \"version\": \"5.2.2\"}, {\"status\": \"affected\", \"version\": \"5.2.4\"}, {\"status\": \"affected\", \"version\": \"5.2.3\"}, {\"status\": \"affected\", \"version\": \"5.2.5\"}, {\"status\": \"affected\", \"version\": \"5.2.47\"}, {\"status\": \"affected\", \"version\": \"5.3.0\"}, {\"status\": \"affected\", \"version\": \"5.3.1\"}, {\"status\": \"affected\", \"version\": \"5.3.2\"}, {\"status\": \"affected\", \"version\": \"5.3.3\"}, {\"status\": \"affected\", \"version\": \"5.3.4\"}, {\"status\": \"affected\", \"version\": \"6.0.0\"}, {\"status\": \"affected\", \"version\": \"6.0.1\"}, {\"status\": \"affected\", \"version\": \"6.0.2\"}, {\"status\": \"affected\", \"version\": \"6.1.1\"}, {\"status\": \"affected\", \"version\": \"6.1.2\"}, {\"status\": \"affected\", \"version\": \"6.1.3\"}, {\"status\": \"affected\", \"version\": \"6.1.4\"}, {\"status\": \"affected\", \"version\": \"6.1.12\"}, {\"status\": \"affected\", \"version\": \"6.1.22\"}, {\"status\": \"affected\", \"version\": \"6.1.32\"}, {\"status\": \"affected\", \"version\": \"6.1.36\"}, {\"status\": \"affected\", \"version\": \"6.1.42\"}, {\"status\": \"affected\", \"version\": \"6.2.1\"}, {\"status\": \"affected\", \"version\": \"6.2.2\"}, {\"status\": \"affected\", \"version\": \"6.2.3\"}, {\"status\": \"affected\", \"version\": \"6.2.25\"}, {\"status\": \"affected\", \"version\": \"6.2.11\"}, {\"status\": \"affected\", \"version\": \"6.3.2\"}, {\"status\": \"affected\", \"version\": \"6.3.3\"}, {\"status\": \"affected\", \"version\": \"6.3.15\"}, {\"status\": \"affected\", \"version\": \"6.4.1\"}, {\"status\": \"affected\", \"version\": \"6.4.2\"}, {\"status\": \"affected\", \"version\": \"6.4.3\"}, {\"status\": \"affected\", \"version\": \"6.5.1\"}, {\"status\": \"affected\", \"version\": \"6.5.2\"}, {\"status\": \"affected\", \"version\": \"6.5.3\"}, {\"status\": \"affected\", \"version\": \"6.5.25\"}, {\"status\": \"affected\", \"version\": \"6.5.26\"}, {\"status\": \"affected\", \"version\": \"6.5.28\"}, {\"status\": \"affected\", \"version\": \"6.5.29\"}, {\"status\": \"affected\", \"version\": \"6.5.32\"}, {\"status\": \"affected\", \"version\": \"6.5.33\"}, {\"status\": \"affected\", \"version\": \"6.6.2\"}, {\"status\": \"affected\", \"version\": \"6.6.3\"}, {\"status\": \"affected\", \"version\": \"6.6.25\"}, {\"status\": \"affected\", \"version\": \"6.6.4\"}, {\"status\": \"affected\", \"version\": \"7.0.1\"}, {\"status\": \"affected\", \"version\": \"7.0.2\"}, {\"status\": \"affected\", \"version\": \"7.0.12\"}, {\"status\": \"affected\", \"version\": \"7.0.14\"}, {\"status\": \"affected\", \"version\": \"7.1.1\"}, {\"status\": \"affected\", \"version\": \"7.1.15\"}, {\"status\": \"affected\", \"version\": \"7.1.2\"}, {\"status\": \"affected\", \"version\": \"7.1.3\"}, {\"status\": \"affected\", \"version\": \"6.7.1\"}, {\"status\": \"affected\", \"version\": \"6.7.2\"}, {\"status\": \"affected\", \"version\": \"6.7.3\"}, {\"status\": \"affected\", \"version\": \"6.7.4\"}, {\"status\": \"affected\", \"version\": \"7.2.0\"}, {\"status\": \"affected\", \"version\": \"7.2.1\"}, {\"status\": \"affected\", \"version\": \"7.2.2\"}, {\"status\": \"affected\", \"version\": \"7.3.1\"}, {\"status\": \"affected\", \"version\": \"7.3.15\"}, {\"status\": \"affected\", \"version\": \"7.3.2\"}, {\"status\": \"affected\", \"version\": \"7.3.3\"}, {\"status\": \"affected\", \"version\": \"7.3.5\"}, {\"status\": \"affected\", \"version\": \"7.4.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2\"}, {\"status\": \"affected\", \"version\": \"6.8.1\"}, {\"status\": \"affected\", \"version\": \"6.8.2\"}, {\"status\": \"affected\", \"version\": \"7.5.1\"}, {\"status\": \"affected\", \"version\": \"7.5.3\"}, {\"status\": \"affected\", \"version\": \"7.5.2\"}, {\"status\": \"affected\", \"version\": \"7.5.4\"}, {\"status\": \"affected\", \"version\": \"7.5.5\"}, {\"status\": \"affected\", \"version\": \"7.6.1\"}, {\"status\": \"affected\", \"version\": \"7.6.2\"}, {\"status\": \"affected\", \"version\": \"7.7.1\"}, {\"status\": \"affected\", \"version\": \"7.7.2\"}, {\"status\": \"affected\", \"version\": \"7.7.21\"}, {\"status\": \"affected\", \"version\": \"6.9.1\"}, {\"status\": \"affected\", \"version\": \"6.9.2\"}, {\"status\": \"affected\", \"version\": \"7.8.1\"}, {\"status\": \"affected\", \"version\": \"7.8.2\"}, {\"status\": \"affected\", \"version\": \"7.9.1\"}, {\"status\": \"affected\", \"version\": \"7.9.2\"}, {\"status\": \"affected\", \"version\": \"7.9.21\"}, {\"status\": \"affected\", \"version\": \"7.10.1\"}, {\"status\": \"affected\", \"version\": \"7.10.2\"}]}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-dhcp-dos-3tgPKRdm\", \"name\": \"cisco-sa-iosxr-dhcp-dos-3tgPKRdm\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition.\\r\\n\\r This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a crash of the dhcpd process. While the dhcpd process is restarting, which may take approximately two minutes, DHCPv4 server services are unavailable on the affected device. This could temporarily prevent network access to clients that join the network during that time period and rely on the DHCPv4 server of the affected device.\\r\\n\\r Notes: \\r\\n\\r \\r Only the dhcpd process crashes and eventually restarts automatically. The router does not reload.\\r This vulnerability only applies to DHCPv4. DHCP version 6 (DHCPv6) is not affected.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-476\", \"description\": \"NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2024-03-13T16:42:27.815Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-20266\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-14T15:00:38.372Z\", \"dateReserved\": \"2023-11-08T15:08:07.624Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2024-03-13T16:42:27.815Z\", \"assignerShortName\": \"cisco\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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