CVE-2023-46847
HighSquid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest Authentication.
Published Nov 3, 2023 · Updated Sep 29, 2026 · Also known as ALPINE-CVE-2023-46847, DEBIAN-CVE-2023-46847, GHSA-phqj-m8gv-cq4g, ROOT-OS-ALPINE-318-CVE-2023-46847, UBUNTU-CVE-2023-46847
Key Facts
Patch immediately- CVE-2023-46847 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Squid (Squid-Cache), Enterprise Linux (Redhat), Enterprise Linux Eus (Redhat) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 88% probability of exploitation in the next 30 days.
- Fixed versions are available, including libecap 1.0.1-2.module_el8.6.0+2741+01592ae8, libecap 1.0.1-2.module+el8.3.0+7819+eb7d4ef6, libecap 1.0.1-2.module+el8.4.0+404+316a0dc5.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
88%
Higher than 99.7% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2023-46847 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest Authentication.
Affected Products
142 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| SquidSquid-Cache | >= 3.2.0.1 | 6.4 |
| Enterprise LinuxRedhat | 8.0, 9.0 | n/a |
| Enterprise Linux EusRedhat | 8.6, 8.8, 9.0, 9.2 | n/a |
| Enterprise Linux For Arm 64Redhat | 8.0_aarch64 | n/a |
| Enterprise Linux For Ibm Z SystemsRedhat | 8.0_s390x | n/a |
Patched Releases
libecap
1.0.1-2.module_el8.6.0+2741+01592ae8, 1.0.1-2.module+el8.3.0+7819+eb7d4ef6, 1.0.1-2.module+el8.4.0+404+316a0dc5, 1.0.1-2.module+el8.9.0+1437+df5ea8f0, 1.0.1-2.module+el8.9.0+90083+f7556140
libecap-devel
1.0.1-2.module+el8.3.0+7819+eb7d4ef6, 1.0.1-2.module+el8.9.0+90083+f7556140
rootio-squid
5.9-r00071, 5.9-r00072, 5.9-r00073, 5.9-r00074, 5.9-r00075, 6.4-r0
Squid
4.10-1ubuntu1.8, 4.13-10+deb11u3, 4.17-150000.5.38.1, 4.17-3.ph3, 4.17-3.ph4, 4.17-4.30.1, 4.6-1+deb10u9, 5.7-0ubuntu0.22.04.2, 5.7-150400.3.12.1, 5.7-2+deb12u1, 5.9-r00071, 5.9-r00072, 5.9-r00073, 5.9-r00074, 5.9-r00075, 6.4, 6.4-1, 6.4-1.1, 6.4-r0, 6.5-1, 6.5-1.ph5, 7:3.1.23-24.0.1.el6, 7:3.1.23-24.el6_10.1, 7:3.5.20-12.el7_6.2, 7:3.5.20-17.0.1.el7_9.9, 7:3.5.20-17.50.amzn1, 7:3.5.20-17.amzn2.7.10, 7:4.15-6.0.1.module+el8.8.0+90059+985ac402, 7:4.15-6.module_el8.8.0+3670+56cb3c8e.1.alma.1, 7:4.15-6.module+el8.8.0+1273+55f5b063, 7:4.15-7.module_el8.9.0+3680+f9142978.1.alma.1, 7:4.15-7.module+el8.9.0+1568+6d4fd5d4.1, 7:4.15-7.module+el8.9.0+90083+f7556140.1, 7:5.5-5.el9_2.1, 7:5.5-6.el9_3.1, 7:5.8-1.amzn2023.0.1
squid-migration-script
7:3.5.20-17.0.1.el7_9.9, 7:3.5.20-17.50.amzn1, 7:3.5.20-17.amzn2.7.10
squid-sysvinit
7:3.5.20-17.0.1.el7_9.9, 7:3.5.20-17.amzn2.7.10
squid:4
8080020231030214932.63b34585
squid3
3.5.12-1ubuntu7.16+esm2, 3.5.27-1ubuntu1.14+esm1
squid34
7:3.4.14-15.0.1.el6, 7:3.4.14-15.el6_10.1
Timeline
Publicly disclosed
Nov 3, 2023
Last updated
Sep 29, 2026
Weakness Type
- CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
References
- advisoryRHSA-2023:6266
- advisoryRHSA-2023:6267
- advisoryRHSA-2023:6268
- advisoryRHSA-2023:6748
- advisoryRHSA-2023:6801
FAQ
Common Questions.
Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest Authentication.
Affected: Squid (Squid-Cache) versions >= 3.2.0.1; Enterprise Linux (Redhat) versions 8.0, 9.0; Enterprise Linux Eus (Redhat) versions 8.6, 8.8, 9.0, 9.2, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including libecap 1.0.1-2.module_el8.6.0+2741+01592ae8, libecap 1.0.1-2.module+el8.3.0+7819+eb7d4ef6, libecap 1.0.1-2.module+el8.4.0+404+316a0dc5.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
Is CVE-2023-46847 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo