CVE-2024-20308

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 underflow, 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 denial of service (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: 2025-06-30 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-20308 is rated Moderate Risk (52.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.80%). 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-2024-20308

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 0.69% 0.80% +0.11%
2 2026-03-16 0.91% 0.69% -0.21%
3 2025-12-28 — 0.91% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-20308

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.6 3.1 HIGH
CVSS:3.1/AV:N/AC:L/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: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: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.
 3.9 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-2024-20308

Affected software / configurations for CVE-2024-20308

Vendor Product Version Raw CPE
cisco ios 12.4\(22\)md cpe:2.3:o:cisco:ios:12.4\(22\)md:*:*:*:*:*:*:*
cisco ios 12.4\(22\)md1 cpe:2.3:o:cisco:ios:12.4\(22\)md1:*:*:*:*:*:*:*
cisco ios 12.4\(22\)md2 cpe:2.3:o:cisco:ios:12.4\(22\)md2:*:*:*:*:*:*:*
cisco ios 12.4\(22\)mda cpe:2.3:o:cisco:ios:12.4\(22\)mda:*:*:*:*:*:*:*
cisco ios 12.4\(22\)mda1 cpe:2.3:o:cisco:ios:12.4\(22\)mda1:*:*:*:*:*:*:*
cisco ios 12.4\(22\)mda2 cpe:2.3:o:cisco:ios:12.4\(22\)mda2:*:*:*:*:*:*:*
cisco ios 12.4\(22\)mda3 cpe:2.3:o:cisco:ios:12.4\(22\)mda3:*:*:*:*:*:*:*
cisco ios 12.4\(22\)mda4 cpe:2.3:o:cisco:ios:12.4\(22\)mda4:*:*:*:*:*:*:*
cisco ios 12.4\(22\)mda5 cpe:2.3:o:cisco:ios:12.4\(22\)mda5:*:*:*:*:*:*:*
cisco ios 12.4\(22\)mda6 cpe:2.3:o:cisco:ios:12.4\(22\)mda6:*:*:*:*:*:*:*
cisco ios 12.4\(22\)t cpe:2.3:o:cisco:ios:12.4\(22\)t:*:*:*:*:*:*:*
cisco ios 12.4\(22\)t1 cpe:2.3:o:cisco:ios:12.4\(22\)t1:*:*:*:*:*:*:*
cisco ios 12.4\(22\)t2 cpe:2.3:o:cisco:ios:12.4\(22\)t2:*:*:*:*:*:*:*
cisco ios 12.4\(22\)t3 cpe:2.3:o:cisco:ios:12.4\(22\)t3:*:*:*:*:*:*:*
cisco ios 12.4\(22\)t4 cpe:2.3:o:cisco:ios:12.4\(22\)t4:*:*:*:*:*:*:*
cisco ios 12.4\(22\)t5 cpe:2.3:o:cisco:ios:12.4\(22\)t5:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr1 cpe:2.3:o:cisco:ios:12.4\(22\)xr1:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr2 cpe:2.3:o:cisco:ios:12.4\(22\)xr2:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr3 cpe:2.3:o:cisco:ios:12.4\(22\)xr3:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr4 cpe:2.3:o:cisco:ios:12.4\(22\)xr4:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr5 cpe:2.3:o:cisco:ios:12.4\(22\)xr5:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr6 cpe:2.3:o:cisco:ios:12.4\(22\)xr6:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr7 cpe:2.3:o:cisco:ios:12.4\(22\)xr7:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr8 cpe:2.3:o:cisco:ios:12.4\(22\)xr8:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr9 cpe:2.3:o:cisco:ios:12.4\(22\)xr9:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr10 cpe:2.3:o:cisco:ios:12.4\(22\)xr10:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr11 cpe:2.3:o:cisco:ios:12.4\(22\)xr11:*:*:*:*:*:*:*
cisco ios 12.4\(22\)xr12 cpe:2.3:o:cisco:ios:12.4\(22\)xr12:*:*:*:*:*:*:*
cisco ios 12.4\(24\)md cpe:2.3:o:cisco:ios:12.4\(24\)md:*:*:*:*:*:*:*
cisco ios 12.4\(24\)md1 cpe:2.3:o:cisco:ios:12.4\(24\)md1:*:*:*:*:*:*:*
cisco ios 12.4\(24\)md2 cpe:2.3:o:cisco:ios:12.4\(24\)md2:*:*:*:*:*:*:*
cisco ios 12.4\(24\)md3 cpe:2.3:o:cisco:ios:12.4\(24\)md3:*:*:*:*:*:*:*
cisco ios 12.4\(24\)md4 cpe:2.3:o:cisco:ios:12.4\(24\)md4:*:*:*:*:*:*:*
cisco ios 12.4\(24\)md5 cpe:2.3:o:cisco:ios:12.4\(24\)md5:*:*:*:*:*:*:*
cisco ios 12.4\(24\)md6 cpe:2.3:o:cisco:ios:12.4\(24\)md6:*:*:*:*:*:*:*
cisco ios 12.4\(24\)md7 cpe:2.3:o:cisco:ios:12.4\(24\)md7:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda1 cpe:2.3:o:cisco:ios:12.4\(24\)mda1:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda2 cpe:2.3:o:cisco:ios:12.4\(24\)mda2:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda3 cpe:2.3:o:cisco:ios:12.4\(24\)mda3:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda4 cpe:2.3:o:cisco:ios:12.4\(24\)mda4:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda5 cpe:2.3:o:cisco:ios:12.4\(24\)mda5:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda6 cpe:2.3:o:cisco:ios:12.4\(24\)mda6:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda7 cpe:2.3:o:cisco:ios:12.4\(24\)mda7:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda8 cpe:2.3:o:cisco:ios:12.4\(24\)mda8:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda9 cpe:2.3:o:cisco:ios:12.4\(24\)mda9:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda10 cpe:2.3:o:cisco:ios:12.4\(24\)mda10:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda11 cpe:2.3:o:cisco:ios:12.4\(24\)mda11:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda12 cpe:2.3:o:cisco:ios:12.4\(24\)mda12:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mda13 cpe:2.3:o:cisco:ios:12.4\(24\)mda13:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb cpe:2.3:o:cisco:ios:12.4\(24\)mdb:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb1 cpe:2.3:o:cisco:ios:12.4\(24\)mdb1:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb3 cpe:2.3:o:cisco:ios:12.4\(24\)mdb3:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb4 cpe:2.3:o:cisco:ios:12.4\(24\)mdb4:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb5 cpe:2.3:o:cisco:ios:12.4\(24\)mdb5:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb5a cpe:2.3:o:cisco:ios:12.4\(24\)mdb5a:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb6 cpe:2.3:o:cisco:ios:12.4\(24\)mdb6:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb7 cpe:2.3:o:cisco:ios:12.4\(24\)mdb7:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb8 cpe:2.3:o:cisco:ios:12.4\(24\)mdb8:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb9 cpe:2.3:o:cisco:ios:12.4\(24\)mdb9:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb10 cpe:2.3:o:cisco:ios:12.4\(24\)mdb10:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb11 cpe:2.3:o:cisco:ios:12.4\(24\)mdb11:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb12 cpe:2.3:o:cisco:ios:12.4\(24\)mdb12:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb13 cpe:2.3:o:cisco:ios:12.4\(24\)mdb13:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb14 cpe:2.3:o:cisco:ios:12.4\(24\)mdb14:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb15 cpe:2.3:o:cisco:ios:12.4\(24\)mdb15:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb16 cpe:2.3:o:cisco:ios:12.4\(24\)mdb16:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb17 cpe:2.3:o:cisco:ios:12.4\(24\)mdb17:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb18 cpe:2.3:o:cisco:ios:12.4\(24\)mdb18:*:*:*:*:*:*:*
cisco ios 12.4\(24\)mdb19 cpe:2.3:o:cisco:ios:12.4\(24\)mdb19:*:*:*:*:*:*:*
cisco ios 12.4\(24\)t cpe:2.3:o:cisco:ios:12.4\(24\)t:*:*:*:*:*:*:*
cisco ios 12.4\(24\)t1 cpe:2.3:o:cisco:ios:12.4\(24\)t1:*:*:*:*:*:*:*
cisco ios 12.4\(24\)t2 cpe:2.3:o:cisco:ios:12.4\(24\)t2:*:*:*:*:*:*:*
cisco ios 12.4\(24\)t3 cpe:2.3:o:cisco:ios:12.4\(24\)t3:*:*:*:*:*:*:*
cisco ios 12.4\(24\)t3e cpe:2.3:o:cisco:ios:12.4\(24\)t3e:*:*:*:*:*:*:*
cisco ios 12.4\(24\)t3f cpe:2.3:o:cisco:ios:12.4\(24\)t3f:*:*:*:*:*:*:*
cisco ios 12.4\(24\)t4 cpe:2.3:o:cisco:ios:12.4\(24\)t4:*:*:*:*:*:*:*
cisco ios 12.4\(24\)t4a cpe:2.3:o:cisco:ios:12.4\(24\)t4a:*:*:*:*:*:*:*
cisco ios 12.4\(24\)t4b cpe:2.3:o:cisco:ios:12.4\(24\)t4b:*:*:*:*:*:*:*
cisco ios 12.4\(24\)t4c cpe:2.3:o:cisco:ios:12.4\(24\)t4c:*:*:*:*:*:*:*
cisco ios 12.4\(24\)t4d cpe:2.3:o:cisco:ios:12.4\(24\)t4d:*:*:*:*:*:*:*

References for CVE-2024-20308

cvelogic Threat Intelligence