CVE-2017-8807: vbf_stp_error in bin/varnishd/cache/cache_fetch.c in Varnish HTTP Cache 4.1.x before 4.1.9 and 5.x before 5.2.

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CRITICAL 9.1REMOTEWATCHLISTUPGRADEUPGRADEMITIGATE

CVE-2017-8807 is a critical-severity flaw (CVSS 9.1) affecting varnish, varnish cache, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

vbf_stp_error in bin/varnishd/cache/cache_fetch.c in Varnish HTTP Cache 4.1.x before 4.1.9 and 5.x before 5.2.1 allows remote attackers to obtain sensitive information from process memory because a VFP_GetStorage buffer is larger than intended in certain circumstances involving -sfile Stevedore transient objects.

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.1% (top 9%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-11-16
Last modified	2026-06-17

Publisher (CNA): Debian GNU/Linux · Vendor: debian · varnish cache project · varnish-cache

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

Am I affected?

Timeline

2017-11-16 02:29 UTCPublished CVE record published
2026-06-17 01:26 UTCUpdated Record last modified

varnish-cache varnish UPGRADE

Affected: >= 4.1.0 and < 4.1.9

Fixed in: 4.1.9

Safe to downgrade to: a release before 4.1.0

1. Check installed version

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

2. UPGRADE to 4.1.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade varnish

Note

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

3. If no update is available yet, DOWNGRADE to a release before 4.1.0 (Debian / Ubuntu)

apt-cache madison varnish sudo apt install varnish=<VERSION_BEFORE_4.1.0> sudo apt-mark hold varnish

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list varnish sudo dnf downgrade varnish-<VERSION_BEFORE_4.1.0> sudo dnf versionlock add varnish

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

varnish cache project varnish cache UPGRADE

Affected: >= 5.0.0 and < 5.2.1

Fixed in: 5.2.1

Safe to downgrade to: a release before 5.0.0

1. Check installed version

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

2. UPGRADE to 5.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade varnish-cache

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade varnish-cache

Note

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

3. If no update is available yet, DOWNGRADE to a release before 5.0.0 (Debian / Ubuntu)

apt-cache madison varnish-cache sudo apt install varnish-cache=<VERSION_BEFORE_5.0.0> sudo apt-mark hold varnish-cache

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list varnish-cache sudo dnf downgrade varnish-cache-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add varnish-cache

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

debian debian linux MITIGATE

Affected: 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2017-8807?

varnish: upgrade to 4.1.9; varnish cache: upgrade to 5.2.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-8807 being exploited?

CVE-2017-8807 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-2017-8807 affect?

CVE-2017-8807 affects varnish, varnish cache, debian linux. Severity is critical (CVSS 9.1). vbf_stp_error in bin/varnishd/cache/cache_fetch.c in Varnish HTTP Cache 4.1.x before 4.1.9 and 5.x before 5.2.1 allows remote attackers to obtain sensitive information from process memory because a VFP_GetStorage buffer is larger than inten

How urgent is CVE-2017-8807?

Priority 65/100. Critical severity; EPSS top 9%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities · Varnish vulnerabilities

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References

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