CVE-2017-7443: apt-cacher before 1.7.15 and apt-cacher-ng before 3.4 allow HTTP response splitting via encoded newline charac

Q: How do I fix CVE-2017-7443?

apt-cacher-ng: upgrade to newer than 3.3; apt-cacher: upgrade to newer than 1.7.13. Exact commands for each OS are on this page.

Q: Is CVE-2017-7443 being exploited?

CVE-2017-7443 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-7443 affect?

CVE-2017-7443 affects apt-cacher-ng, apt-cacher. Severity is medium (CVSS 6.1). apt-cacher before 1.7.15 and apt-cacher-ng before 3.4 allow HTTP response splitting via encoded newline characters, related to lack of blocking for the %0[ad] regular expression.

Q: How urgent is CVE-2017-7443?

Priority 35/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADEUPGRADE

CVE-2017-7443 is a medium-severity flaw (CVSS 6.1) affecting apt-cacher-ng, apt-cacher. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

apt-cacher before 1.7.15 and apt-cacher-ng before 3.4 allow HTTP response splitting via encoded newline characters, related to lack of blocking for the %0[ad] regular expression.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-113
Published	2017-04-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: apt-cacher project · apt-cacher-ng project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-04-05 20:59 UTCPublished CVE record published
2026-06-17 01:24 UTCUpdated Record last modified

apt-cacher-ng project apt-cacher-ng UPGRADE

Affected: <= 3.3

Fixed in: newer than 3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy apt-cacher-ng || rpm -q apt-cacher-ng || apt-cacher-ng --version

2. UPGRADE to newer than 3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade apt-cacher-ng

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apt-cacher-ng

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

apt-cacher project apt-cacher UPGRADE

Affected: <= 1.7.13

Fixed in: newer than 1.7.13

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy apt-cacher || rpm -q apt-cacher || apt-cacher --version

2. UPGRADE to newer than 1.7.13 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade apt-cacher

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apt-cacher

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-7443?

apt-cacher-ng: upgrade to newer than 3.3; apt-cacher: upgrade to newer than 1.7.13. Exact commands for each OS are on this page.

Is CVE-2017-7443 being exploited?

CVE-2017-7443 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-7443 affect?

CVE-2017-7443 affects apt-cacher-ng, apt-cacher. Severity is medium (CVSS 6.1). apt-cacher before 1.7.15 and apt-cacher-ng before 3.4 allow HTTP response splitting via encoded newline characters, related to lack of blocking for the %0[ad] regular expression.

How urgent is CVE-2017-7443?

Priority 35/100. No elevated risk signals yet.

Related CVEs

CVE-2025-11146 MEDIUM 5.4 DOWNGRADE Reflected Cross-site scripting (XSS) in Apt-Cacher-NG v3.2.1
CVE-2025-11147 MEDIUM 5.4 DOWNGRADE Reflected cross-site scripting (XSS) in Apt-Cacher-NG v3.2.1
CVE-2020-5202 MEDIUM 5.5 UPGRADE MITIGATE apt-cacher-ng through 3.3 allows local users to obtain sensitive information by hijacking the hardcoded TCP po
CVE-2019-18899 MEDIUM 6.2 UPGRADE MITIGATE The apt-cacher-ng package of openSUSE Leap 15.1 runs operations in user owned directory /run/apt-cacher-ng wit

References

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