CVE-2026-20281 (GCVE-0-2026-20281)
Vulnerability from cvelistv5
Published
2026-09-02 16:14
Modified
2026-09-02 17:58
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Summary
A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to improper memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition. A manual reboot of the device is required to recover from this condition.
Note: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Cisco | Cisco Session Initiation Protocol (SIP) Software |
Version: 12.1(1)SR1 Version: 11.5(1) Version: 10.3(2) Version: 10.2(2) Version: 10.3(1) Version: 10.3(1)SR4 Version: 11.0(1) Version: 10.4(1)SR2 3rd Party Version: 11.7(1) Version: 12.1(1) Version: 11.0(0.7) MPP Version: 9.3(4) 3rd Party Version: 12.5(1)SR2 Version: 10.2(1)SR1 Version: 9.3(4)SR3 3rd Party Version: 10.2(1) Version: 12.5(1) Version: 10.3(1)SR2 Version: 11-0-1MSR1-1 Version: 10.4(1) 3rd Party Version: 12.5(1)SR1 Version: 11.5(1)SR1 Version: 10.1(1)SR2 Version: 12.0(1)SR2 Version: 12.6(1) Version: 10.3(1.11) 3rd Party Version: 12.0(1) Version: 12.0(1)SR1 Version: 9.3(3) Version: 12.5(1)SR3 Version: 10.3(1)SR4b Version: 9.3(4)SR1 3rd Party Version: 10.3(1)SR5 Version: 10.1(1.9) Version: 10.3(1.9) 3rd Party Version: 9.3(4)SR2 3rd Party Version: 10.3(1)SR1 Version: 10.3(1)SR3 Version: 10.1(1)SR1 Version: 12.0(1)SR3 Version: 12.6(1)SR1 Version: 12.7(1) Version: 10.3(1)SR6 Version: 12.8(1) Version: 12.7(1)SR1 Version: 11.0(2)SR1 Version: 11.0(4) Version: 11.0(2) Version: 11.0(4)SR3 Version: 11.0(5) Version: 11.0(3)SR2 Version: 11.0(3)SR4 Version: 11.0(3)SR3 Version: 11.0(2)SR2 Version: 11.0(4)SR1 Version: 11.0(5)SR3 Version: 11.0(3) Version: 11.0(5)SR2 Version: 11.0(3)SR6 Version: 11.0(5)SR1 Version: 11.0(4)SR2 Version: 11.0(3)SR1 Version: 11.0(3)SR5 Version: 11.0(6) Version: 12.8(1)SR1 Version: 12.8(1)SR2 Version: 14.0(1) Version: 14.0(1)SR1 Version: 11.0(6)SR1 Version: 10.3(1)SR7 Version: 14.0(1)SR2 Version: 14.1(1) Version: 14.0(1)SR3 Version: 11.0(6)SR2 Version: 14.1(1)SR1 Version: 14.1(1)SR2 Version: 11.0(6)SR4 Version: 14.2(1) Version: 14.2(1)SR1 Version: 11.0(6)SR5 Version: 14.1(1)SR3 Version: 14.2(1)SR2 Version: 3.1(1) Version: 3.0(1) Version: 2.3(1) Version: 2.3(1)SR1 Version: 2.2(1) Version: 2.1(1) Version: 2.0(1) Version: 14.2(1)SR3 Version: 3.1(1)SR1 Version: 14.3(1) Version: 3.2(1) Version: 14.3(1)SR1 Version: 14.2(1)SR4 Version: 3.3(1) Version: 11.0(6)SR6 Version: 14.3(1)SR2 Version: 3.4(1) Version: 14.3(1)SR3 Version: 3.5(1) Version: 11.0(6)SR7 Version: 3.5(1)SR1 Version: 14.4(1) Version: 3.6(1) Version: 4.0(1) Version: 14.4(1)SR1 Version: 4.1(1) Version: 14.4(1)SR2 Version: 4.1(1)SR1 |
{
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"id": "CVE-2026-20281",
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{
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"timestamp": "2026-09-02T16:45:26.338821Z",
"version": "2.0.3"
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{
"status": "affected",
"version": "10.1(1)SR1"
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{
"status": "affected",
"version": "12.0(1)SR3"
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{
"status": "affected",
"version": "12.6(1)SR1"
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{
"status": "affected",
"version": "12.7(1)"
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{
"status": "affected",
"version": "10.3(1)SR6"
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{
"status": "affected",
"version": "12.8(1)"
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{
"status": "affected",
"version": "12.7(1)SR1"
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{
"status": "affected",
"version": "11.0(2)SR1"
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{
"status": "affected",
"version": "11.0(4)"
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{
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"version": "11.0(2)"
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{
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"version": "11.0(5)"
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{
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"version": "11.0(5)SR1"
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"version": "11.0(4)SR2"
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"version": "11.0(3)SR1"
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{
"status": "affected",
"version": "11.0(3)SR5"
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{
"status": "affected",
"version": "11.0(6)"
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{
"status": "affected",
"version": "12.8(1)SR1"
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"status": "affected",
"version": "12.8(1)SR2"
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{
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"version": "14.0(1)"
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{
"status": "affected",
"version": "14.0(1)SR1"
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{
"status": "affected",
"version": "11.0(6)SR1"
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"status": "affected",
"version": "10.3(1)SR7"
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{
"status": "affected",
"version": "14.0(1)SR2"
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{
"status": "affected",
"version": "14.1(1)"
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{
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{
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"version": "14.2(1)"
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"version": "14.2(1)SR1"
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"version": "14.1(1)SR3"
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"version": "14.2(1)SR2"
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"version": "3.1(1)"
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"version": "14.3(1)"
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"version": "14.2(1)SR4"
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{
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"version": "3.3(1)"
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{
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"version": "11.0(6)SR6"
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{
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"version": "14.3(1)SR2"
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{
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"version": "3.4(1)"
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{
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"version": "14.3(1)SR3"
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{
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],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition.\u0026nbsp;A manual reboot of the device is required to recover from this condition.\r\nNote: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default."
}
],
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-401",
"description": "Missing Release of Memory after Effective Lifetime",
"lang": "en",
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}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-02T16:14:26.432Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-phone-dos-txMYNRzv",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-dos-txMYNRzv"
}
],
"source": {
"advisory": "cisco-sa-phone-dos-txMYNRzv",
"defects": [
"CSCwu46404"
],
"discovery": "EXTERNAL"
},
"title": "Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20281",
"datePublished": "2026-09-02T16:14:26.432Z",
"dateReserved": "2025-10-08T11:59:15.403Z",
"dateUpdated": "2026-09-02T17:58:58.216Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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