CVE-2024-20307

A vulnerability in the IKEv1 fragmentation code of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a heap overflow, resulting in an affected device reloading. This vulnerability exists because crafted, fragmented IKEv1 packets are not properly reassembled. An attacker could exploit this vulnerability by sending crafted UDP packets to an affected system. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: Only traffic that is directed to the affected system can be used to exploit this vulnerability. This vulnerability can be triggered by IPv4 and IPv6 traffic.

Published: 2024-03-27 Last update: 2025-07-30 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-20307 is rated Moderate Risk (43.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.73%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-20307

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.49% 0.73% -0.77%
2 2025-12-28 1.23% 1.49% +0.26%
3 2025-12-27 — 1.23% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-20307

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 4.0 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2024-20307

Affected software / configurations for CVE-2024-20307

Vendor Product Version Raw CPE
cisco ios 15.1\(2\)sg8 cpe:2.3:o:cisco:ios:15.1\(2\)sg8:*:*:*:*:*:*:*
cisco ios 15.1\(2\)sy8 cpe:2.3:o:cisco:ios:15.1\(2\)sy8:*:*:*:*:*:*:*
cisco ios 15.1\(2\)sy9 cpe:2.3:o:cisco:ios:15.1\(2\)sy9:*:*:*:*:*:*:*
cisco ios 15.1\(2\)sy10 cpe:2.3:o:cisco:ios:15.1\(2\)sy10:*:*:*:*:*:*:*
cisco ios 15.1\(2\)sy11 cpe:2.3:o:cisco:ios:15.1\(2\)sy11:*:*:*:*:*:*:*
cisco ios 15.1\(2\)sy12 cpe:2.3:o:cisco:ios:15.1\(2\)sy12:*:*:*:*:*:*:*
cisco ios 15.1\(2\)sy13 cpe:2.3:o:cisco:ios:15.1\(2\)sy13:*:*:*:*:*:*:*
cisco ios 15.1\(2\)sy14 cpe:2.3:o:cisco:ios:15.1\(2\)sy14:*:*:*:*:*:*:*
cisco ios 15.1\(2\)sy15 cpe:2.3:o:cisco:ios:15.1\(2\)sy15:*:*:*:*:*:*:*
cisco ios 15.1\(2\)sy16 cpe:2.3:o:cisco:ios:15.1\(2\)sy16:*:*:*:*:*:*:*
cisco ios 15.2\(1\)sy3 cpe:2.3:o:cisco:ios:15.2\(1\)sy3:*:*:*:*:*:*:*
cisco ios 15.2\(1\)sy4 cpe:2.3:o:cisco:ios:15.2\(1\)sy4:*:*:*:*:*:*:*
cisco ios 15.2\(1\)sy5 cpe:2.3:o:cisco:ios:15.2\(1\)sy5:*:*:*:*:*:*:*
cisco ios 15.2\(1\)sy6 cpe:2.3:o:cisco:ios:15.2\(1\)sy6:*:*:*:*:*:*:*
cisco ios 15.2\(1\)sy7 cpe:2.3:o:cisco:ios:15.2\(1\)sy7:*:*:*:*:*:*:*
cisco ios 15.2\(1\)sy8 cpe:2.3:o:cisco:ios:15.2\(1\)sy8:*:*:*:*:*:*:*
cisco ios 15.2\(3\)e4 cpe:2.3:o:cisco:ios:15.2\(3\)e4:*:*:*:*:*:*:*
cisco ios 15.2\(3\)e5 cpe:2.3:o:cisco:ios:15.2\(3\)e5:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e2 cpe:2.3:o:cisco:ios:15.2\(4\)e2:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e3 cpe:2.3:o:cisco:ios:15.2\(4\)e3:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e4 cpe:2.3:o:cisco:ios:15.2\(4\)e4:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e5 cpe:2.3:o:cisco:ios:15.2\(4\)e5:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e5a cpe:2.3:o:cisco:ios:15.2\(4\)e5a:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e6 cpe:2.3:o:cisco:ios:15.2\(4\)e6:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e7 cpe:2.3:o:cisco:ios:15.2\(4\)e7:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e8 cpe:2.3:o:cisco:ios:15.2\(4\)e8:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e9 cpe:2.3:o:cisco:ios:15.2\(4\)e9:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e10 cpe:2.3:o:cisco:ios:15.2\(4\)e10:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e10a cpe:2.3:o:cisco:ios:15.2\(4\)e10a:*:*:*:*:*:*:*
cisco ios 15.2\(4\)e10d cpe:2.3:o:cisco:ios:15.2\(4\)e10d:*:*:*:*:*:*:*
cisco ios 15.2\(4\)ea4 cpe:2.3:o:cisco:ios:15.2\(4\)ea4:*:*:*:*:*:*:*
cisco ios 15.2\(4\)ea5 cpe:2.3:o:cisco:ios:15.2\(4\)ea5:*:*:*:*:*:*:*
cisco ios 15.2\(4\)ea6 cpe:2.3:o:cisco:ios:15.2\(4\)ea6:*:*:*:*:*:*:*
cisco ios 15.2\(4\)ea7 cpe:2.3:o:cisco:ios:15.2\(4\)ea7:*:*:*:*:*:*:*
cisco ios 15.2\(4\)ea8 cpe:2.3:o:cisco:ios:15.2\(4\)ea8:*:*:*:*:*:*:*
cisco ios 15.2\(4\)ea9 cpe:2.3:o:cisco:ios:15.2\(4\)ea9:*:*:*:*:*:*:*
cisco ios 15.2\(4\)ea9a cpe:2.3:o:cisco:ios:15.2\(4\)ea9a:*:*:*:*:*:*:*
cisco ios 15.2\(4\)ec1 cpe:2.3:o:cisco:ios:15.2\(4\)ec1:*:*:*:*:*:*:*
cisco ios 15.2\(4\)ec2 cpe:2.3:o:cisco:ios:15.2\(4\)ec2:*:*:*:*:*:*:*
cisco ios 15.2\(4\)m11 cpe:2.3:o:cisco:ios:15.2\(4\)m11:*:*:*:*:*:*:*
cisco ios 15.2\(5\)e cpe:2.3:o:cisco:ios:15.2\(5\)e:*:*:*:*:*:*:*
cisco ios 15.2\(5\)ea cpe:2.3:o:cisco:ios:15.2\(5\)ea:*:*:*:*:*:*:*
cisco ios 15.2\(5b\)e cpe:2.3:o:cisco:ios:15.2\(5b\)e:*:*:*:*:*:*:*
cisco ios 15.3\(1\)sy1 cpe:2.3:o:cisco:ios:15.3\(1\)sy1:*:*:*:*:*:*:*
cisco ios 15.3\(1\)sy2 cpe:2.3:o:cisco:ios:15.3\(1\)sy2:*:*:*:*:*:*:*
cisco ios 15.3\(3\)jpi11 cpe:2.3:o:cisco:ios:15.3\(3\)jpi11:*:*:*:*:*:*:*
cisco ios 15.3\(3\)m8 cpe:2.3:o:cisco:ios:15.3\(3\)m8:*:*:*:*:*:*:*
cisco ios 15.3\(3\)m8a cpe:2.3:o:cisco:ios:15.3\(3\)m8a:*:*:*:*:*:*:*
cisco ios 15.3\(3\)m9 cpe:2.3:o:cisco:ios:15.3\(3\)m9:*:*:*:*:*:*:*
cisco ios 15.3\(3\)m10 cpe:2.3:o:cisco:ios:15.3\(3\)m10:*:*:*:*:*:*:*
cisco ios 15.3\(3\)s8 cpe:2.3:o:cisco:ios:15.3\(3\)s8:*:*:*:*:*:*:*
cisco ios 15.3\(3\)s8a cpe:2.3:o:cisco:ios:15.3\(3\)s8a:*:*:*:*:*:*:*
cisco ios 15.3\(3\)s9 cpe:2.3:o:cisco:ios:15.3\(3\)s9:*:*:*:*:*:*:*
cisco ios 15.3\(3\)s10 cpe:2.3:o:cisco:ios:15.3\(3\)s10:*:*:*:*:*:*:*
cisco ios 15.4\(1\)sy cpe:2.3:o:cisco:ios:15.4\(1\)sy:*:*:*:*:*:*:*
cisco ios 15.4\(1\)sy1 cpe:2.3:o:cisco:ios:15.4\(1\)sy1:*:*:*:*:*:*:*
cisco ios 15.4\(1\)sy2 cpe:2.3:o:cisco:ios:15.4\(1\)sy2:*:*:*:*:*:*:*
cisco ios 15.4\(1\)sy3 cpe:2.3:o:cisco:ios:15.4\(1\)sy3:*:*:*:*:*:*:*
cisco ios 15.4\(1\)sy4 cpe:2.3:o:cisco:ios:15.4\(1\)sy4:*:*:*:*:*:*:*
cisco ios 15.4\(3\)s6 cpe:2.3:o:cisco:ios:15.4\(3\)s6:*:*:*:*:*:*:*
cisco ios 15.4\(3\)s6a cpe:2.3:o:cisco:ios:15.4\(3\)s6a:*:*:*:*:*:*:*
cisco ios 15.4\(3\)s7 cpe:2.3:o:cisco:ios:15.4\(3\)s7:*:*:*:*:*:*:*
cisco ios 15.4\(3\)s8 cpe:2.3:o:cisco:ios:15.4\(3\)s8:*:*:*:*:*:*:*
cisco ios 15.4\(3\)s9 cpe:2.3:o:cisco:ios:15.4\(3\)s9:*:*:*:*:*:*:*
cisco ios 15.4\(3\)s10 cpe:2.3:o:cisco:ios:15.4\(3\)s10:*:*:*:*:*:*:*
cisco ios 15.5\(1\)s4 cpe:2.3:o:cisco:ios:15.5\(1\)s4:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy cpe:2.3:o:cisco:ios:15.5\(1\)sy:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy1 cpe:2.3:o:cisco:ios:15.5\(1\)sy1:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy2 cpe:2.3:o:cisco:ios:15.5\(1\)sy2:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy3 cpe:2.3:o:cisco:ios:15.5\(1\)sy3:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy4 cpe:2.3:o:cisco:ios:15.5\(1\)sy4:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy5 cpe:2.3:o:cisco:ios:15.5\(1\)sy5:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy6 cpe:2.3:o:cisco:ios:15.5\(1\)sy6:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy7 cpe:2.3:o:cisco:ios:15.5\(1\)sy7:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy8 cpe:2.3:o:cisco:ios:15.5\(1\)sy8:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy9 cpe:2.3:o:cisco:ios:15.5\(1\)sy9:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy10 cpe:2.3:o:cisco:ios:15.5\(1\)sy10:*:*:*:*:*:*:*
cisco ios 15.5\(1\)sy11 cpe:2.3:o:cisco:ios:15.5\(1\)sy11:*:*:*:*:*:*:*
cisco ios 15.5\(2\)s4 cpe:2.3:o:cisco:ios:15.5\(2\)s4:*:*:*:*:*:*:*
cisco ios 15.5\(2\)t4 cpe:2.3:o:cisco:ios:15.5\(2\)t4:*:*:*:*:*:*:*

References for CVE-2024-20307

cvelogic Threat Intelligence