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01 Record

CVE-2024-20312

A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial

HighPUBLISHEDCNA: cisco
CNA base score7.4 CVSS v3.xCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
View raw JSON

02 Description

A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial

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.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • 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
0.25% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 17.0% of scored records. A rank, not a probability.
NVD base score
7.4 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD analysis status
Modified. 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
2024-03-27 16:56Z2 YR AGO
Last updated
2025-08-26 20:06Z1 YR AGO
Reserved
2023-11-08
Assigning CNA
cisco
Record state
PUBLISHED
Severity
High (CVSS 7.4)
CNA CVSS vector
CVSS:3.1/AV:A/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
7fe9ae4b87d993afe0c753c26fe83c771f90c8330047ea2198e9caf906921a86

05 Affected products

VendorProductVersionsPlatforms
CiscoIOS15.2(1)S, 15.2(2)S, 15.2(1)S1, 15.2(4)S, 15.2(1)S2, 15.2(2)S1, 15.2(2)S2, 15.2(2)S0a, 15.2(2)S0c, 15.2(4)S1, 15.2(4)S4, 15.2(4)S6, 15.2(4)S2, 15.2(4)S5, 15.2(4)S3, 15.2(4)S3a, 15.2(4)S4a, 15.2(4)S7, 15.3(1)T, 15.3(2)T, 15.3(1)T1, 15.3(1)T2, 15.3(1)T3, 15.3(1)T4, 15.3(2)T1, 15.3(2)T2, 15.3(2)T3, 15.3(2)T4, 15.1(2)SG, 15.1(2)SG1, 15.1(2)SG2, 15.1(2)SG3, 15.1(2)SG4, 15.1(2)SG5, 15.1(2)SG6, 15.1(2)SG7, 15.1(2)SG8, 15.2(4)M, 15.2(4)M1, 15.2(4)M2, 15.2(4)M4, 15.2(4)M3, 15.2(4)M5, 15.2(4)M8, 15.2(4)M10, 15.2(4)M7, 15.2(4)M6, 15.2(4)M9, 15.2(4)M6a, 15.2(4)M11, 15.0(1)EX, 15.2(3)GC, 15.2(3)GC1, 15.2(4)GC, 15.2(4)GC1, 15.2(4)GC2, 15.2(4)GC3, 15.1(1)SY, 15.1(1)SY1, 15.1(2)SY, 15.1(2)SY1, 15.1(2)SY2, 15.1(1)SY2, 15.1(1)SY3, 15.1(2)SY3, 15.1(1)SY4, 15.1(2)SY4, 15.1(1)SY5, 15.1(2)SY5, 15.1(2)SY4a, 15.1(1)SY6, 15.1(2)SY6, 15.1(2)SY7, 15.1(2)SY8, 15.1(2)SY9, 15.1(2)SY10, 15.1(2)SY11, 15.1(2)SY12, 15.1(2)SY13, 15.1(2)SY14, 15.1(2)SY15, 15.1(2)SY16, 15.3(1)S, 15.3(2)S, 15.3(3)S, 15.3(1)S2, 15.3(1)S1, 15.3(2)S2, 15.3(2)S1, 15.3(3)S1, 15.3(3)S2, 15.3(3)S3, 15.3(3)S6, 15.3(3)S4, 15.3(3)S1a, 15.3(3)S5, 15.3(3)S7, 15.3(3)S8, 15.3(3)S9, 15.3(3)S10, 15.3(3)S8a, 15.4(1)T, 15.4(2)T, 15.4(1)T2, 15.4(1)T1, 15.4(1)T3, 15.4(2)T1, 15.4(2)T3, 15.4(2)T2, 15.4(1)T4, 15.4(2)T4, 15.2(1)E, 15.2(2)E, 15.2(1)E1, 15.2(3)E, 15.2(1)E2, 15.2(1)E3, 15.2(2)E1, 15.2(4)E, 15.2(3)E1, 15.2(2)E2, 15.2(2)E3, 15.2(2a)E2, 15.2(3)E2, 15.2(3a)E, 15.2(3)E3, 15.2(4)E1, 15.2(2)E4, 15.2(2)E5, 15.2(4)E2, 15.2(3)E4, 15.2(5)E, 15.2(4)E3, 15.2(2)E6, 15.2(5)E1, 15.2(2)E5a, 15.2(3)E5, 15.2(2)E5b, 15.2(5a)E1, 15.2(4)E4, 15.2(2)E7, 15.2(5)E2, 15.2(6)E, 15.2(5)E2b, 15.2(4)E5, 15.2(5)E2c, 15.2(2)E8, 15.2(6)E0a, 15.2(6)E1, 15.2(2)E7b, 15.2(4)E5a, 15.2(6)E0c, 15.2(4)E6, 15.2(6)E2, 15.2(2)E9, 15.2(4)E7, 15.2(7)E, 15.2(2)E10, 15.2(4)E8, 15.2(6)E2a, 15.2(7)E1, 15.2(7)E0b, 15.2(7)E0s, 15.2(6)E3, 15.2(4)E9, 15.2(7)E2, 15.2(7a)E0b, 15.2(4)E10, 15.2(7)E3, 15.2(7)E1a, 15.2(7b)E0b, 15.2(4)E10a, 15.2(7)E4, 15.2(8)E, 15.2(8)E1, 15.2(7)E5, 15.2(7)E6, 15.2(8)E2, 15.2(4)E10d, 15.2(7)E7, 15.2(8)E3, 15.2(7)E8, 15.2(8)E4, 15.2(4)E10e, 15.2(7)E9, 15.2(8)E5, 15.4(1)S, 15.4(2)S, 15.4(3)S, 15.4(1)S1, 15.4(1)S2, 15.4(2)S1, 15.4(1)S3, 15.4(3)S1, 15.4(2)S2, 15.4(3)S2, 15.4(3)S3, 15.4(1)S4, 15.4(2)S3, 15.4(2)S4, 15.4(3)S4, 15.4(3)S5, 15.4(3)S6, 15.4(3)S7, 15.4(3)S6a, 15.4(3)S8, 15.4(3)S9, 15.4(3)S10, 15.3(3)M, 15.3(3)M1, 15.3(3)M2, 15.3(3)M3, 15.3(3)M5, 15.3(3)M4, 15.3(3)M6, 15.3(3)M7, 15.3(3)M8, 15.3(3)M9, 15.3(3)M10, 15.3(3)M8a, 15.2(1)EY, 15.2(1)SY, 15.2(1)SY1, 15.2(1)SY0a, 15.2(1)SY2, 15.2(2)SY, 15.2(1)SY1a, 15.2(2)SY1, 15.2(2)SY2, 15.2(1)SY3, 15.2(1)SY4, 15.2(2)SY3, 15.2(1)SY5, 15.2(1)SY6, 15.2(1)SY7, 15.2(1)SY8, 15.4(1)CG, 15.4(1)CG1, 15.4(2)CG, 15.5(1)S, 15.5(2)S, 15.5(1)S1, 15.5(3)S, 15.5(1)S2, 15.5(1)S3, 15.5(2)S1, 15.5(2)S2, 15.5(3)S1, 15.5(3)S1a, 15.5(2)S3, 15.5(3)S2, 15.5(3)S0a, 15.5(3)S3, 15.5(1)S4, 15.5(2)S4, 15.5(3)S4, 15.5(3)S5, 15.5(3)S6, 15.5(3)S6a, 15.5(3)S7, 15.5(3)S6b, 15.5(3)S8, 15.5(3)S9, 15.5(3)S10, 15.5(3)S9a, 15.2(2)EB, 15.2(2)EB1, 15.2(2)EB2, 15.2(6)EB, 15.5(1)T, 15.5(1)T1, 15.5(2)T, 15.5(1)T2, 15.5(1)T3, 15.5(2)T1, 15.5(2)T2, 15.5(2)T3, 15.5(2)T4, 15.5(1)T4, 15.2(2)EA, 15.2(2)EA1, 15.2(2)EA2, 15.2(3)EA, 15.2(4)EA, 15.2(4)EA1, 15.2(2)EA3, 15.2(4)EA3, 15.2(5)EA, 15.2(4)EA4, 15.2(4)EA5, 15.2(4)EA6, 15.2(4)EA7, 15.2(4)EA8, 15.2(4)EA9, 15.2(4)EA9a, 15.5(3)M, 15.5(3)M1, 15.5(3)M0a, 15.5(3)M2, 15.5(3)M3, 15.5(3)M4, 15.5(3)M4a, 15.5(3)M5, 15.5(3)M6, 15.5(3)M7, 15.5(3)M6a, 15.5(3)M8, 15.5(3)M9, 15.5(3)M10, 15.5(3)SN, 15.6(1)S, 15.6(2)S, 15.6(2)S1, 15.6(1)S1, 15.6(1)S2, 15.6(2)S2, 15.6(1)S3, 15.6(2)S3, 15.6(1)S4, 15.6(2)S4, 15.6(1)T, 15.6(2)T, 15.6(1)T0a, 15.6(1)T1, 15.6(2)T1, 15.6(1)T2, 15.6(2)T2, 15.6(1)T3, 15.6(2)T3, 15.3(1)SY, 15.3(1)SY1, 15.3(1)SY2, 15.6(2)SP, 15.6(2)SP1, 15.6(2)SP2, 15.6(2)SP3, 15.6(2)SP4, 15.6(2)SP5, 15.6(2)SP6, 15.6(2)SP7, 15.6(2)SP8, 15.6(2)SP9, 15.6(2)SP10, 15.6(2)SN, 15.6(3)M, 15.6(3)M1, 15.6(3)M0a, 15.6(3)M1b, 15.6(3)M2, 15.6(3)M3, 15.6(3)M3a, 15.6(3)M4, 15.6(3)M5, 15.6(3)M6, 15.6(3)M7, 15.6(3)M6a, 15.6(3)M6b, 15.6(3)M8, 15.6(3)M9, 15.2(4)EC1, 15.2(4)EC2, 15.4(1)SY, 15.4(1)SY1, 15.4(1)SY2, 15.4(1)SY3, 15.4(1)SY4, 15.5(1)SY, 15.5(1)SY1, 15.5(1)SY2, 15.5(1)SY3, 15.5(1)SY4, 15.5(1)SY5, 15.5(1)SY6, 15.5(1)SY7, 15.5(1)SY8, 15.5(1)SY9, 15.5(1)SY10, 15.5(1)SY11, 15.5(1)SY12, 15.7(3)M, 15.7(3)M1, 15.7(3)M0a, 15.7(3)M3, 15.7(3)M2, 15.7(3)M4, 15.7(3)M5, 15.7(3)M4a, 15.7(3)M4b, 15.7(3)M6, 15.7(3)M7, 15.7(3)M8, 15.7(3)M9, 15.8(3)M, 15.8(3)M1, 15.8(3)M0a, 15.8(3)M0b, 15.8(3)M2, 15.8(3)M1a, 15.8(3)M3, 15.8(3)M2a, 15.8(3)M4, 15.8(3)M3a, 15.8(3)M3b, 15.8(3)M5, 15.8(3)M6, 15.8(3)M7, 15.8(3)M8, 15.8(3)M9, 15.9(3)M, 15.9(3)M1, 15.9(3)M0a, 15.9(3)M2, 15.9(3)M3, 15.9(3)M2a, 15.9(3)M3a, 15.9(3)M4, 15.9(3)M3b, 15.9(3)M5, 15.9(3)M4a, 15.9(3)M6, 15.9(3)M7, 15.9(3)M6a, 15.9(3)M6b, 15.9(3)M8, 15.9(3)M7a, 15.9(3)M8b—
CiscoCisco IOS XE Software3.7.0S, 3.7.1S, 3.7.2S, 3.7.3S, 3.7.4S, 3.7.5S, 3.7.6S, 3.7.7S, 3.7.4aS, 3.7.2tS, 3.7.0bS, 3.7.1aS, 3.8.0S, 3.8.1S, 3.8.2S, 3.9.1S, 3.9.0S, 3.9.2S, 3.9.1aS, 3.9.0aS, 3.2.0SE, 3.2.1SE, 3.2.2SE, 3.2.3SE, 3.3.0SE, 3.3.1SE, 3.3.2SE, 3.3.3SE, 3.3.4SE, 3.3.5SE, 3.3.0XO, 3.3.1XO, 3.3.2XO, 3.4.0SG, 3.4.2SG, 3.4.1SG, 3.4.3SG, 3.4.4SG, 3.4.5SG, 3.4.6SG, 3.4.7SG, 3.4.8SG, 3.5.0E, 3.5.1E, 3.5.2E, 3.5.3E, 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, 3.10.1xbS, 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, 3.12.0aS, 3.12.4S, 3.13.0S, 3.13.1S, 3.13.2S, 3.13.3S, 3.13.4S, 3.13.5S, 3.13.2aS, 3.13.0aS, 3.13.5aS, 3.13.6S, 3.13.7S, 3.13.6aS, 3.13.7aS, 3.13.8S, 3.13.9S, 3.13.10S, 3.6.0E, 3.6.1E, 3.6.2aE, 3.6.2E, 3.6.3E, 3.6.4E, 3.6.5E, 3.6.6E, 3.6.5aE, 3.6.5bE, 3.6.7E, 3.6.8E, 3.6.7bE, 3.6.9E, 3.6.10E, 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, 3.7.0E, 3.7.1E, 3.7.2E, 3.7.3E, 3.7.4E, 3.7.5E, 3.16.0S, 3.16.1S, 3.16.1aS, 3.16.2S, 3.16.2aS, 3.16.0cS, 3.16.3S, 3.16.2bS, 3.16.3aS, 3.16.4S, 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, 3.17.1aS, 3.17.3S, 3.17.4S, 16.1.1, 16.1.2, 16.1.3, 16.2.1, 16.2.2, 3.8.0E, 3.8.1E, 3.8.2E, 3.8.3E, 3.8.4E, 3.8.5E, 3.8.5aE, 3.8.6E, 3.8.7E, 3.8.8E, 3.8.9E, 3.8.10E, 3.8.10eE, 16.3.1, 16.3.2, 16.3.3, 16.3.1a, 16.3.4, 16.3.5, 16.3.5b, 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, 16.5.1a, 16.5.1b, 16.5.2, 16.5.3, 3.18.0aS, 3.18.0S, 3.18.1S, 3.18.2S, 3.18.3S, 3.18.4S, 3.18.0SP, 3.18.1SP, 3.18.1aSP, 3.18.1bSP, 3.18.1cSP, 3.18.2SP, 3.18.2aSP, 3.18.3SP, 3.18.4SP, 3.18.3aSP, 3.18.3bSP, 3.18.5SP, 3.18.6SP, 3.18.7SP, 3.18.8aSP, 3.18.9SP, 3.9.0E, 3.9.1E, 3.9.2E, 16.6.1, 16.6.2, 16.6.3, 16.6.4, 16.6.5, 16.6.4a, 16.6.5a, 16.6.6, 16.6.7, 16.6.8, 16.6.9, 16.6.10, 16.7.1, 16.7.1a, 16.7.1b, 16.7.2, 16.7.3, 16.7.4, 16.8.1, 16.8.1a, 16.8.1b, 16.8.1s, 16.8.1c, 16.8.1d, 16.8.2, 16.8.1e, 16.8.3, 16.9.1, 16.9.2, 16.9.1a, 16.9.1b, 16.9.1s, 16.9.3, 16.9.4, 16.9.3a, 16.9.5, 16.9.5f, 16.9.6, 16.9.7, 16.9.8, 16.10.1, 16.10.1a, 16.10.1b, 16.10.1s, 16.10.1c, 16.10.1e, 16.10.1d, 16.10.2, 16.10.1f, 16.10.1g, 16.10.3, 3.10.0E, 3.10.1E, 3.10.0cE, 3.10.2E, 3.10.3E, 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, 16.12.1w, 16.12.2, 16.12.1y, 16.12.2a, 16.12.3, 16.12.8, 16.12.2s, 16.12.1x, 16.12.1t, 16.12.4, 16.12.3s, 16.12.3a, 16.12.4a, 16.12.5, 16.12.6, 16.12.1z1, 16.12.5a, 16.12.5b, 16.12.1z2, 16.12.6a, 16.12.7, 16.12.9, 16.12.10, 16.12.10a, 3.11.0E, 3.11.1E, 3.11.2E, 3.11.3E, 3.11.1aE, 3.11.4E, 3.11.3aE, 3.11.5E, 3.11.6E, 3.11.7E, 3.11.8E, 3.11.9E, 17.1.1, 17.1.1a, 17.1.1s, 17.1.1t, 17.1.3, 17.2.1, 17.2.1r, 17.2.1a, 17.2.1v, 17.2.2, 17.2.3, 17.3.1, 17.3.2, 17.3.3, 17.3.1a, 17.3.1w, 17.3.2a, 17.3.1x, 17.3.1z, 17.3.4, 17.3.5, 17.3.4a, 17.3.6, 17.3.4b, 17.3.4c, 17.3.5a, 17.3.5b, 17.3.7, 17.3.8, 17.3.8a, 17.4.1, 17.4.2, 17.4.1a, 17.4.1b, 17.4.2a, 17.5.1, 17.5.1a, 17.6.1, 17.6.2, 17.6.1w, 17.6.1a, 17.6.1x, 17.6.3, 17.6.1y, 17.6.1z, 17.6.3a, 17.6.4, 17.6.1z1, 17.6.5, 17.6.5a, 17.7.1, 17.7.1a, 17.7.1b, 17.7.2, 17.10.1, 17.10.1a, 17.10.1b, 17.8.1, 17.8.1a, 17.9.1, 17.9.1w, 17.9.2, 17.9.1a, 17.9.1x, 17.9.1y, 17.9.3, 17.9.2a, 17.9.1x1, 17.9.3a, 17.9.1y1, 17.11.1, 17.11.1a, 17.11.99SW—

06 References