CVE-2017-7773: Heap-based Buffer Overflow write in Graphite2 library in Firefox before 54 in lz4::decompress src/Decompressor

Q: How do I fix CVE-2017-7773?

firefox: upgrade to 54.0; graphite2: upgrade to 1.3.10. Exact commands for each OS are on this page.

Q: Is CVE-2017-7773 being exploited?

CVE-2017-7773 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-2017-7773 affect?

CVE-2017-7773 affects firefox, graphite2. Severity is high (CVSS 8.8). Heap-based Buffer Overflow write in Graphite2 library in Firefox before 54 in lz4::decompress src/Decompressor.

Q: How urgent is CVE-2017-7773?

Priority 54/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADEUPGRADE

CVE-2017-7773 is a high-severity flaw (CVSS 8.8) affecting firefox, graphite2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based Buffer Overflow write in Graphite2 library in Firefox before 54 in lz4::decompress src/Decompressor.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-119
Published	2019-04-15
Last modified	2026-06-17

Publisher (CNA): Mozilla Corporation · Vendor: mozilla · sil

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

Am I affected?

Timeline

2019-04-15 12:31 UTCPublished CVE record published
2026-06-17 01:25 UTCUpdated Record last modified

mozilla firefox UPGRADE

Affected: < 54.0

Fixed in: 54.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 54.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firefox

Note

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

sil graphite2 UPGRADE

Affected: < 1.3.10

Fixed in: 1.3.10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy graphite2 || rpm -q graphite2 || graphite2 --version

2. UPGRADE to 1.3.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade graphite2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade graphite2

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-2017-7773?

firefox: upgrade to 54.0; graphite2: upgrade to 1.3.10. Exact commands for each OS are on this page.

Is CVE-2017-7773 being exploited?

CVE-2017-7773 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-2017-7773 affect?

CVE-2017-7773 affects firefox, graphite2. Severity is high (CVSS 8.8). Heap-based Buffer Overflow write in Graphite2 library in Firefox before 54 in lz4::decompress src/Decompressor.

How urgent is CVE-2017-7773?

Priority 54/100. High severity; Public exploit reference

Software pages

Mozilla Firefox vulnerabilities

Related CVEs

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CVE-2026-74988 CRITICAL 9.8 UPGRADE UPGRADE Internally found bugs present in Firefox ESR 153.0 and Firefox 153
CVE-2026-74987 CRITICAL 9.8 UPGRADE UPGRADE Internally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153
CVE-2026-74969 HIGH 8.8 UPGRADE UPGRADE Race condition, use-after-free in the Layout: Text and Fonts component

References

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