apt-cacher-ng through 3.3 allows local users to obtain sensitive information by hijacking the hardcoded TCP port.
apt-cacher-ng through 3.3 allows local users to obtain sensitive information by hijacking the hardcoded TCP port. The /usr/lib/apt-cacher-ng/acngtool program attempts to connect to apt-cacher-ng via TCP on localhost port 3142, even if the explicit SocketPath=/var/run/apt-cacher-ng/socket command-line option is passed. The cron job /etc/cron.daily/apt-cacher-ng (which is active by default) attempts this periodically. Because 3142 is an unprivileged port, any local user can try to bind to this port and will receive requests from acngtool. There can be sensitive data in these requests, e.g., if AdminAuth is enabled in /etc/apt-cacher-ng/security.conf. This sensitive data can leak to unprivileged local users that manage to bind to this port before the apt-cacher-ng daemon can.
- Published
- Jan 21, 2020
- Updated
- Jun 16, 2026
- EPSS
- 0.5% · 38th percentile
- CWE
- —
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| apt-cacher-ng project | apt-cacher-ng | cpe:2.3:a:apt-cacher-ng_project:apt-cacher-ng |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| opensuse | backports | cpe:2.3:o:opensuse:backports |
| 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.
- apt-cacher-ng project apt-cacher-ngup to 3.3 inclusive
- debian debian linux10.0
- debian debian linux8.0
- debian debian linux9.0
- opensuse backportssle-15
- opensuse leap15.1
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | apt-cacher-ng | before 3.3.1-1 | 3.3.1-1 |
| openSUSE:Leap 15.1 | apt-cacher-ng | before 3.1-lp151.3.3.1 | 3.1-lp151.3.3.1 |
| SUSE:Package Hub 15 SP1 | apt-cacher-ng | before 3.1-bp151.4.3.1 | 3.1-bp151.4.3.1 |
Same product
apt-cacher-ng project: all recordsOther highest-scoring records for the same primary product.
- CVE-2017-7443apt-cacher before 1.7.15 and apt-cacher-ng before 3.4 allow HTTP response splitting via encoded newline characters, related to lack of block24Monitor
- CVE-2025-11147Reflected Cross-site scripting (XSS) vulnerability in Apt-Cacher-NG20Monitor
- CVE-2025-11146Reflected Cross-site scripting (XSS) vulnerability in Apt-Cacher-NG20Monitor
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 |
|---|---|---|
| debian:apt-cacher-ng | 3.3.1-1 · Debian:12 | Package registry (OSV) |
| opensuse:apt-cacher-ng | 3.1-lp151.3.3.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| suse:apt-cacher-ng | 3.1-bp151.4.3.1 · SUSE:Package Hub 15 SP1 | 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.
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.
No commit or PR link among the references.
Credits
All researchersFinders, 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
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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 helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.opensuse.org/opensuse-security-announce/2020-01/msg00057.html
- lists.opensuse.org/opensuse-security-announce/2020-01/msg00065.html
- security-tracker.debian.org/tracker/CVE-2020-5202
Vendor advisories and official records. Exploit/PoC links are deliberately left out.