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CVE-2023-7256

14
FAUCET Score

CVE-2023-7256 is a double-free vulnerability affecting libpcap, specifically during remote packet capture setup, where the sock_initaddress() function can lead to freeaddrinfo() being called twice on the same memory block. This vulnerability has a CVSS score of 4.4 (Medium), indicating a local attack vector with low complexity, requiring high privileges, and potentially leading to a denial of service. There is currently no public exploit code available, it is not listed in CISA's KEV catalog, and it has received minimal community and media attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.10.5CPE matchmatch criteria
cpe:2.3:a:tcpdump:libpcap:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.4MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
0.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.22%
Probability of exploitation in next 30 days
EPSS Percentile
13.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0022 is in the 57th percentile among its peer group of 3,720 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (20)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 20209-17084Fixed in: 1.10.5-1
microsoftpatch availablevia msrc
Product: 17643-17084Fixed in: 1.10.5-1
microsoftpatch availablevia msrc
Product: 20213-17086Fixed in: 1.10.1-4
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 x64Fixed in: 1.10.5-1
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 x64Fixed in: 7.95-2
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 ARMFixed in: 1.10.5-1
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 ARMFixed in: 7.95-2
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 1.10.1-4
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 7.93-3
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 1.10.1-4
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 7.93-3
microsoftpatch availablevia msrc
Product: 20217-17086Fixed in: 7.93-3
microsoftpatch availablevia msrc
Product: 17642-17084Fixed in: 7.95-2
microsoftpatch availablevia msrc
Product: azl3 libpcap 1.10.4-1 on Azure Linux 3.0Fixed in: 1.10.5-1
microsoftpatch availablevia msrc
Product: azl3 libpcap 1.10.5-1 on Azure Linux 3.0Fixed in: 1.10.5-1
microsoftpatch availablevia msrc
Product: cbl2 libpcap 1.10.1-4 on CBL Mariner 2.0Fixed in: 1.10.1-4
microsoftpatch availablevia msrc
Product: cbl2 nmap 7.93-3 on CBL Mariner 2.0Fixed in: 7.93-3
microsoftpatch availablevia msrc
Product: azl3 nmap 7.95-2 on Azure Linux 3.0Fixed in: 7.95-2
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: rhcos

Vendor Advisories (3)

microsoft2024-Nov/CVE-2023-7256

CVE-2023-7256

Nov 12, 2024
redhatCVE-2023-7256Moderate

libpcap: Double Free in libcap

Aug 31, 2024
microsoft2024-Aug/CVE-2023-7256Moderate

Double-free in libpcap before 1.10.5 with remote packet capture support.

Aug 13, 2024

References

github.com / the-tcpdump-group/libpcap/commit/262e4f34979872d822ccedf9f318ed89c4d31c03
Patch
github.com / the-tcpdump-group/libpcap/commit/2aa69b04d8173b18a0e3492e0c8f2f7fabdf642d
Patch