CVE-2023-2295: libreswan Uncontrolled Resource Consumption
Vulnerability summary
CVE-2023-2295 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in libreswan. EPSS estimates a 1.58% chance of exploitation in the next 30 days, higher than 75.5% of scored vulnerabilities.
Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4Timeline
- 17-05-2023PublishedVulnerability first disclosed.
- 22-01-2025Last modifiedVulnerability information updated.
Description
A vulnerability was found in the libreswan library. This security issue occurs when an IKEv1 Aggressive Mode packet is received with only unacceptable crypto algorithms, and the response packet is not sent with a zero responder SPI. When a subsequent packet is received where the sender reuses the libreswan responder SPI as its own initiator SPI, the pluto daemon state machine crashes. No remote code execution is possible. This CVE exists because of a CVE-2023-30570 security regression for libreswan package in Red Hat Enterprise Linux 8.8 and Red Hat Enterprise Linux 9.2.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · Red hatEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.58%
Chance of exploitation in the next 30 days
Percentile
76%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.58% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat7 products
- enterprise_linux8.0 | 9.0
- enterprise_linux_eus8.8 | 9.2
- enterprise_linux_server_aus8.8 | 9.2
- enterprise_linux_server_tus8.8
- libreswan< 0:4.9-3.el8_8 | < 0:4.9-4.el9_2
Libreswan1 product
- libreswan4.9-1.el8 | 4.9-1.el9
Ubuntu1 product
- libreswanAll versions (No fix recorded)
3 vendors · 9 products
