CVE-2019-12854· NVD / CVE Program· CNA mitre

Due to incorrect string termination, Squid cachemgr.cgi 4.0 through 4.7 may access unallocated memory.

Due to incorrect string termination, Squid cachemgr.cgi 4.0 through 4.7 may access unallocated memory. On systems with memory access protections, this can cause the CGI process to terminate unexpectedly, resulting in a denial of service for all clients using it.

HighCVSS 7.5 · v3.1—No exploit Fix available

Published: Aug 15, 2019
Updated: Jun 16, 2026
EPSS: 11.7% · 96th percentile
CWE: —

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Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 4 / 30 · 11.7%

Affected systems

Vendor	Product	CPE
squid-cache	squid	cpe:2.3:a:squid-cache:squid
debian	debian linux	cpe:2.3:o:debian:debian_linux
fedoraproject	fedora	cpe:2.3:o:fedoraproject:fedora
canonical	ubuntu linux	cpe:2.3:o:canonical:ubuntu_linux
opensuse	leap	cpe:2.3:o:opensuse:leap

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

canonical ubuntu linux16.04
canonical ubuntu linux18.04
canonical ubuntu linux19.04
canonical ubuntu linux19.10
debian debian linux10.0
fedoraproject fedora29
opensuse leap15.0
opensuse leap15.1
squid-cache squid4.0 and later · up to 4.7 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Same product

squid-cache: all records

Other highest-scoring records for the same primary product.

CVE-2023-46847Squid: denial of service in http digest authentication
57Plan
CVE-2024-25617Denial of Service in HTTP Header parser in squid proxy
56Plan
CVE-2023-49285Denial of Service in HTTP Message Processing in Squid
56Plan
CVE-2021-31806An issue was discovered in Squid before 4.15 and 5.x before 5.0.6.
55Plan
CVE-2020-8450An issue was discovered in Squid before 4.10.
51Plan
CVE-2024-25111SQUID-2024:1 Denial of Service in HTTP Chunked Decoding
50Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
almalinux:libecap	1.0.1-2.module_el8.6.0+2741+01592ae8 · AlmaLinux:8	Package registry (OSV)
almalinux:libecap-devel	1.0.1-2.module_el8.6.0+2741+01592ae8 · AlmaLinux:8	Package registry (OSV)
debian:squid	4.8-1 · Debian:12	Package registry (OSV)
opensuse:squid	4.9-lp150.13.1 · openSUSE:Leap 15.0	Package registry (OSV)
red hat:libecap	0:1.0.1-2.module+el8.1.0+4044+36416a77 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:libecap-debuginfo	0:1.0.1-2.module+el8.1.0+4044+36416a77 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:libecap-debugsource	0:1.0.1-2.module+el8.1.0+4044+36416a77 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:libecap-devel	0:1.0.1-2.module+el8.1.0+4044+36416a77 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:squid	7:4.11-3.module+el8.3.0+7851+7808b5f9 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:squid-debuginfo	7:4.11-3.module+el8.3.0+7851+7808b5f9 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:squid-debugsource	7:4.11-3.module+el8.3.0+7851+7808b5f9 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
rocky linux:libecap	0:1.0.1-2.module+el8.4.0+404+316a0dc5 · Rocky Linux:8	Package registry (OSV)
suse:squid	4.9-5.11.1 · SUSE:Linux Enterprise Module for Server Applications 15	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

www.squid-cache.orgpatch squid-4-2981

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

Fix✗ → ✓Sep 28, 2026, 10:47 PM UTC

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	libecap	before 1.0.1-2.module_el8.6.0+2741+01592ae8	1.0.1-2.module_el8.6.0+2741+01592ae8
AlmaLinux:8	libecap-devel	before 1.0.1-2.module_el8.6.0+2741+01592ae8	1.0.1-2.module_el8.6.0+2741+01592ae8
Debian:10	squid	before 4.6-1+deb10u1	4.6-1+deb10u1
Debian:12	squid	before 4.8-1	4.8-1
openSUSE:Leap 15.0	squid	before 4.9-lp150.13.1	4.9-lp150.13.1
openSUSE:Leap 15.1	squid	before 4.9-lp151.2.7.1	4.9-lp151.2.7.1
Red Hat:enterprise_linux:8::appstream	libecap	before 0:1.0.1-2.module+el8.1.0+4044+36416a77	0:1.0.1-2.module+el8.1.0+4044+36416a77
Red Hat:enterprise_linux:8::appstream	libecap-debuginfo	before 0:1.0.1-2.module+el8.1.0+4044+36416a77	0:1.0.1-2.module+el8.1.0+4044+36416a77
Red Hat:enterprise_linux:8::appstream	libecap-debugsource	before 0:1.0.1-2.module+el8.1.0+4044+36416a77	0:1.0.1-2.module+el8.1.0+4044+36416a77
Red Hat:enterprise_linux:8::appstream	libecap-devel	before 0:1.0.1-2.module+el8.1.0+4044+36416a77	0:1.0.1-2.module+el8.1.0+4044+36416a77
Red Hat:enterprise_linux:8::appstream	squid	before 7:4.11-3.module+el8.3.0+7851+7808b5f9	7:4.11-3.module+el8.3.0+7851+7808b5f9
Red Hat:enterprise_linux:8::appstream	squid-debuginfo	before 7:4.11-3.module+el8.3.0+7851+7808b5f9	7:4.11-3.module+el8.3.0+7851+7808b5f9
Red Hat:enterprise_linux:8::appstream	squid-debugsource	before 7:4.11-3.module+el8.3.0+7851+7808b5f9	7:4.11-3.module+el8.3.0+7851+7808b5f9
Rocky Linux:8	libecap	before 0:1.0.1-2.module+el8.4.0+404+316a0dc5	0:1.0.1-2.module+el8.4.0+404+316a0dc5
SUSE:Linux Enterprise Module for Server Applications 15	squid	before 4.9-5.11.1	4.9-5.11.1