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01 Record

CVE-2024-20436

A vulnerability in the HTTP Server feature of Cisco IOS XE Software when the Telephony Service feature is enabled could allow an unauthenticated, remote attacker to cause a denial of service (DoS)

HighPUBLISHEDCNA: cisco
CNA base score8.6 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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02 Description

A vulnerability in the HTTP Server feature of Cisco IOS XE Software when the Telephony Service feature is enabled could allow an unauthenticated, remote attacker to cause a denial of service (DoS)

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.86% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 58.1% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2024-09-25 16:26Z2 YR AGO
Last updated
2024-09-25 18:42Z2 YR AGO
Reserved
2023-11-08
Assigning CNA
cisco
Record state
PUBLISHED
Severity
High (CVSS 8.6)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weaknesses
  • CWE-476NULL Pointer DereferenceBase
Data version
5.1
Document digest
65b28e8262d3c6ff50e7e3c40b26ad6fba35e74b0cec51d9eb8fcdbc29fe8ea3

05 Affected products

VendorProductVersionsPlatforms
CiscoCisco IOS XE Software3.9.1S, 3.9.2S, 3.9.0aS, 3.10.0S, 3.10.1S, 3.10.2S, 3.10.3S, 3.10.4S, 3.10.5S, 3.10.6S, 3.10.2tS, 3.10.7S, 3.10.8S, 3.10.8aS, 3.10.9S, 3.10.10S, 3.11.1S, 3.11.2S, 3.11.0S, 3.11.3S, 3.11.4S, 3.12.0S, 3.12.1S, 3.12.2S, 3.12.3S, 3.12.4S, 3.13.0S, 3.13.1S, 3.13.2S, 3.13.3S, 3.13.4S, 3.13.5S, 3.13.6S, 3.13.7S, 3.13.6aS, 3.13.8S, 3.13.9S, 3.13.10S, 3.14.0S, 3.14.1S, 3.14.2S, 3.14.3S, 3.14.4S, 3.15.0S, 3.15.1S, 3.15.2S, 3.15.1cS, 3.15.3S, 3.15.4S, 3.16.0S, 3.16.1aS, 3.16.2S, 3.16.0cS, 3.16.3S, 3.16.4aS, 3.16.4bS, 3.16.5S, 3.16.4dS, 3.16.6S, 3.16.7S, 3.16.6bS, 3.16.7aS, 3.16.7bS, 3.16.8S, 3.16.9S, 3.16.10S, 3.17.0S, 3.17.1S, 3.17.2S, 3.17.3S, 3.17.4S, 16.2.1, 16.2.2, 16.3.1, 16.3.2, 16.3.3, 16.3.1a, 16.3.4, 16.3.5, 16.3.6, 16.3.7, 16.3.8, 16.3.9, 16.3.10, 16.3.11, 16.4.1, 16.4.2, 16.4.3, 16.5.1, 16.5.1b, 16.5.2, 16.5.3, 3.18.2aSP, 16.6.1, 16.6.2, 16.6.3, 16.6.4, 16.6.5, 16.6.6, 16.6.7, 16.6.8, 16.6.9, 16.6.10, 16.7.1, 16.7.2, 16.7.3, 16.8.1, 16.8.1s, 16.8.2, 16.8.3, 16.9.1, 16.9.2, 16.9.1s, 16.9.3, 16.9.4, 16.9.5, 16.9.6, 16.9.7, 16.9.8, 16.10.1, 16.10.1a, 16.10.1b, 16.10.1s, 16.10.1e, 16.10.2, 16.10.3, 16.11.1, 16.11.1a, 16.11.1b, 16.11.2, 16.11.1s, 16.12.1, 16.12.1s, 16.12.1a, 16.12.1c, 16.12.2, 16.12.3, 16.12.8, 16.12.2s, 16.12.4, 16.12.3s, 16.12.4a, 16.12.5, 16.12.6, 16.12.7, 17.1.1, 17.1.1s, 17.1.1t, 17.1.3, 17.2.1, 17.2.1r, 17.2.1v, 17.2.2, 17.2.3, 17.3.1, 17.3.2, 17.3.3, 17.3.1a, 17.3.4, 17.3.5, 17.3.4a, 17.3.6, 17.3.7, 17.3.8, 17.3.8a, 17.4.1, 17.4.2, 17.4.1a, 17.4.1b, 17.5.1, 17.5.1a, 17.6.1, 17.6.2, 17.6.1a, 17.6.3, 17.6.3a, 17.6.4, 17.6.5, 17.6.6, 17.6.6a, 17.6.5a, 17.7.1, 17.7.1a, 17.7.2, 17.10.1, 17.10.1a, 17.10.1b, 17.8.1, 17.8.1a, 17.9.1, 17.9.2, 17.9.1a, 17.9.3, 17.9.2a, 17.9.3a, 17.9.4, 17.9.4a, 17.11.1, 17.11.1a, 17.12.1, 17.12.1a—
ciscoios_xe3.9.1s, 3.9.2s, 3.9.0as, 3.10.0s, 3.10.1s, 3.10.2s, 3.10.3s, 3.10.4s, 3.10.5s, 3.10.6s, 3.10.2ts, 3.10.7s, 3.10.8s, 3.10.8as, 3.10.9s, 3.10.10s, 3.11.1s, 3.11.2s, 3.11.0s, 3.11.3s, 3.11.4s, 3.12.0s, 3.12.1s, 3.12.2s, 3.12.3s, 3.12.4s, 3.13.0s, 3.13.1s, 3.13.2s, 3.13.3s, 3.13.4s, 3.13.5s, 3.13.6s, 3.13.7s, 3.13.6as, 3.13.8s, 3.13.9s, 3.13.10s, 3.14.0s, 3.14.1s, 3.14.2s, 3.14.3s, 3.14.4s, 3.15.0s, 3.15.1s, 3.15.2s, 3.15.1cs, 3.15.3s, 3.15.4s, 3.16.0s, 3.16.1as, 3.16.2s, 3.16.0cs, 3.16.3s, 3.16.4as, 3.16.4bs, 3.16.5s, 3.16.4ds, 3.16.6s, 3.16.7s, 3.16.6bs, 3.16.7as, 3.16.7bs, 3.16.8s, 3.16.9s, 3.16.10s, 3.17.0s, 3.17.1s, 3.17.2s, 3.17.3s, 3.17.4s, 16.2.1, 16.2.2, 16.3.1, 16.3.2, 16.3.3, 16.3.1a, 16.3.4, 16.3.5, 16.3.6, 16.3.7, 16.3.8, 16.3.9, 16.3.10, 16.3.11, 16.4.1, 16.4.2, 16.4.3, 16.5.1, 16.5.1b, 16.5.2, 16.5.3, 3.18.2asp, 16.6.1, 16.6.2, 16.6.3, 16.6.4, 16.6.5, 16.6.6, 16.6.7, 16.6.8, 16.6.9, 16.6.10, 16.7.1, 16.7.2, 16.7.3, 16.8.1, 16.8.1s, 16.8.2, 16.8.3, 16.9.1, 16.9.2, 16.9.1s, 16.9.3, 16.9.4, 16.9.5, 16.9.6, 16.9.7, 16.9.8, 16.10.1, 16.10.1a, 16.10.1b, 16.10.1s, 16.10.1e, 16.10.2, 16.10.3, 16.11.1, 16.11.1a, 16.11.1b, 16.11.2, 16.11.1s, 16.12.1, 16.12.1s, 16.12.1a, 16.12.1c, 16.12.2, 16.12.3, 16.12.8, 16.12.2s, 16.12.4, 16.12.3s, 16.12.4a, 16.12.5, 16.12.6, 16.12.7, 17.1.1, 17.1.1s, 17.1.1t, 17.1.3, 17.2.1, 17.2.1r, 17.2.1v, 17.2.2, 17.2.3, 17.3.1, 17.3.2, 17.3.3, 17.3.1a, 17.3.4, 17.3.5, 17.3.4a, 17.3.6, 17.3.7, 17.3.8, 17.3.8a, 17.4.1, 17.4.2, 17.4.1a, 17.4.1b, 17.5.1, 17.5.1a, 17.6.1, 17.6.2, 17.6.1a, 17.6.3, 17.6.3a, 17.6.4, 17.6.5, 17.6.6, 17.6.6a, 17.6.5a, 17.7.1, 17.7.1a, 17.7.2, 17.10.1, 17.10.1a, 17.10.1b, 17.8.1, 17.8.1a, 17.9.1, 17.9.2, 17.9.1a, 17.9.3, 17.9.2a, 17.9.3a, 17.9.4, 17.9.4a, 17.11.1, 17.11.1a, 17.12.1, 17.12.1a—

06 References