CVE-2017-7778: A number of security vulnerabilities in the Graphite 2 library including out-of-bounds reads, buffer overflow

Q: How do I fix CVE-2017-7778?

firefox: upgrade to 52.2.0, 54.0; thunderbird: upgrade to 52.2.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2017-7778 being exploited?

CVE-2017-7778 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-2017-7778 affect?

CVE-2017-7778 affects firefox, thunderbird, debian linux. Severity is critical (CVSS 9.8). A number of security vulnerabilities in the Graphite 2 library including out-of-bounds reads, buffer overflow reads and writes, and the use of uninitialized memory. These issues were addressed in Graphite 2 version 1.3.10. This vulnerabilit

Q: How urgent is CVE-2017-7778?

Priority 67/100. Critical severity; EPSS top 8%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADEUPGRADEMITIGATE

CVE-2017-7778 is a critical-severity flaw (CVSS 9.8) affecting firefox, thunderbird, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A number of security vulnerabilities in the Graphite 2 library including out-of-bounds reads, buffer overflow reads and writes, and the use of uninitialized memory. These issues were addressed in Graphite 2 version 1.3.10. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

Why this priority

Critical severity
EPSS top 8%: 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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.0% (top 8%)
CISA exploited list	No
Weakness	CWE-119, CWE-125, CWE-787
Published	2018-06-11
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2018-06-11 21:29 UTCPublished CVE record published
2026-06-17 01:25 UTCUpdated Record last modified

mozilla firefox UPGRADE

Affected: < 52.2.0 · < 54.0

Fixed in: 52.2.0, 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 52.2.0 (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.

mozilla thunderbird UPGRADE

Affected: < 52.2.0

Fixed in: 52.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 52.2.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade thunderbird

Note

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

debian debian linux MITIGATE

Affected: 8.0 · 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

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.

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-2017-7778?

firefox: upgrade to 52.2.0, 54.0; thunderbird: upgrade to 52.2.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-7778 being exploited?

CVE-2017-7778 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-2017-7778 affect?

CVE-2017-7778 affects firefox, thunderbird, debian linux. Severity is critical (CVSS 9.8). A number of security vulnerabilities in the Graphite 2 library including out-of-bounds reads, buffer overflow reads and writes, and the use of uninitialized memory. These issues were addressed in Graphite 2 version 1.3.10. This vulnerabilit

How urgent is CVE-2017-7778?

Priority 67/100. Critical severity; EPSS top 8%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities · Mozilla Firefox vulnerabilities · Mozilla Thunderbird vulnerabilities

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References

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