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NVD / CVE Program· CNA mitre

CVE-2019-12527: An issue was discovered in Squid 4.0.23 through 4.7.

Noroxi assessment

Priority: Plan (action score 50/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 49% (FIRST EPSS); higher than 98.8% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: libecap (AlmaLinux:8) 1.0.1-2.module_el8.6.0+2741+01592ae8; libecap-devel (AlmaLinux:8) 1.0.1-2.module_el8.6.0+2741+01592ae8; squid (Debian:10) 4.6-1+deb10u1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Add it to your regular patch cycle. Upgrade to libecap (AlmaLinux:8) 1.0.1-2.module_el8.6.0+2741+01592ae8; libecap-devel (AlmaLinux:8) 1.0.1-2.module_el8.6.0+2741+01592ae8; squid (Debian:10) 4.6-1+deb10u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

An issue was discovered in Squid 4.0.23 through 4.7. When checking Basic Authentication with HttpHeader::getAuth, Squid uses a global buffer to store the decoded data. Squid does not check that the decoded length isn't greater than the buffer, leading to a heap-based buffer overflow with user controlled data.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Jul 11, 2019
Updated
Jun 16, 2026
EPSS
49.0% · 98th percentile

Report tools

JSON

Action score

50

Plan

Add it to your regular patch cycle.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
15 / 30 · 49.0%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2019-12527

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
squid-cachesquid
fedoraprojectfedora
debiandebian linux
canonicalubuntu linux
redhatenterprise linux
redhatenterprise linux eus
redhatenterprise linux server aus
redhatenterprise linux server tus

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
  • debian debian linux10.0
  • fedoraproject fedora29
  • redhat enterprise linux8.0
  • redhat enterprise linux eus8.1
  • redhat enterprise linux eus8.2
  • redhat enterprise linux eus8.4
  • redhat enterprise linux eus8.6
  • redhat enterprise linux server aus8.2
  • redhat enterprise linux server aus8.4
  • redhat enterprise linux server aus8.6
  • redhat enterprise linux server tus8.2
  • redhat enterprise linux server tus8.4
  • redhat enterprise linux server tus8.6
  • squid-cache squid4.0.23 and later · up to 4.7 inclusive

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8libecapbefore 1.0.1-2.module_el8.6.0+2741+01592ae81.0.1-2.module_el8.6.0+2741+01592ae8
AlmaLinux:8libecap-develbefore 1.0.1-2.module_el8.6.0+2741+01592ae81.0.1-2.module_el8.6.0+2741+01592ae8
Debian:10squidbefore 4.6-1+deb10u14.6-1+deb10u1
Debian:12squidbefore 4.8-14.8-1
openSUSE:Leap 15.0squidbefore 4.9-lp150.13.14.9-lp150.13.1
openSUSE:Leap 15.1squidbefore 4.9-lp151.2.7.14.9-lp151.2.7.1
openSUSE:Tumbleweedsquidbefore 4.16-1.54.16-1.5
Red Hat:enterprise_linux:8::appstreamlibecapbefore 0:1.0.1-2.module+el8.0.0+4045+70edde920:1.0.1-2.module+el8.0.0+4045+70edde92
Red Hat:enterprise_linux:8::appstreamlibecap-debuginfobefore 0:1.0.1-2.module+el8.0.0+4045+70edde920:1.0.1-2.module+el8.0.0+4045+70edde92
Red Hat:enterprise_linux:8::appstreamlibecap-debugsourcebefore 0:1.0.1-2.module+el8.0.0+4045+70edde920:1.0.1-2.module+el8.0.0+4045+70edde92
Red Hat:enterprise_linux:8::appstreamlibecap-develbefore 0:1.0.1-2.module+el8.0.0+4045+70edde920:1.0.1-2.module+el8.0.0+4045+70edde92
Red Hat:enterprise_linux:8::appstreamsquidbefore 7:4.4-5.module+el8.0.0+4045+70edde927:4.4-5.module+el8.0.0+4045+70edde92
Red Hat:enterprise_linux:8::appstreamsquid-debuginfobefore 7:4.4-5.module+el8.0.0+4045+70edde927:4.4-5.module+el8.0.0+4045+70edde92
Red Hat:enterprise_linux:8::appstreamsquid-debugsourcebefore 7:4.4-5.module+el8.0.0+4045+70edde927:4.4-5.module+el8.0.0+4045+70edde92
Rocky Linux:8libecapbefore 0:1.0.1-2.module+el8.4.0+404+316a0dc50:1.0.1-2.module+el8.4.0+404+316a0dc5
SUSE:Linux Enterprise Module for Server Applications 15squidbefore 4.9-5.11.14.9-5.11.1

Same product

squid-cache: all records

Other highest-scoring records for the same primary product.

  • 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

Published before and after this one in the same product

  • ← EarlierCVE-2019-13345Jul 5, 2019 · The cachemgr.cgi web module of Squid through 4.7 has XSS via the user_name or auth parameter.
    46Plan
  • ← EarlierCVE-2019-12525Jul 11, 2019 · An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7.
    46Plan
  • Later →CVE-2019-12529Jul 11, 2019 · An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7.
    25Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
almalinux:libecap1.0.1-2.module_el8.6.0+2741+01592ae8 · AlmaLinux:8Package registry (OSV)
almalinux:libecap-devel1.0.1-2.module_el8.6.0+2741+01592ae8 · AlmaLinux:8Package registry (OSV)
debian:squid4.8-1 · Debian:12Package registry (OSV)
opensuse:squid4.9-lp150.13.1 · openSUSE:Leap 15.0Package registry (OSV)
red hat:libecap0:1.0.1-2.module+el8.0.0+4045+70edde92 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libecap-debuginfo0:1.0.1-2.module+el8.0.0+4045+70edde92 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libecap-debugsource0:1.0.1-2.module+el8.0.0+4045+70edde92 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libecap-devel0:1.0.1-2.module+el8.0.0+4045+70edde92 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:squid7:4.4-5.module+el8.0.0+4045+70edde92 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:squid-debuginfo7:4.4-5.module+el8.0.0+4045+70edde92 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:squid-debugsource7:4.4-5.module+el8.0.0+4045+70edde92 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:libecap0:1.0.1-2.module+el8.4.0+404+316a0dc5 · Rocky Linux:8Package registry (OSV)
suse:squid4.9-5.11.1 · SUSE:Linux Enterprise Module for Server Applications 15Package 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.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

Change log

  1. Fix✗ → ✓

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

References

Show all references (10 more)

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

All records