CVE-2016-9577: A vulnerability was discovered in SPICE before 0.13.90 in the server's protocol handling

Q: How do I fix CVE-2016-9577?

spice: upgrade to 0.13.90; debian linux: mitigate or apply the listed mitigation; enterprise linux desktop: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2016-9577 being exploited?

CVE-2016-9577 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-2016-9577 affect?

CVE-2016-9577 affects spice, debian linux, enterprise linux desktop. Severity is high (CVSS 7.5). A vulnerability was discovered in SPICE before 0.13.90 in the server's protocol handling. An authenticated attacker could send crafted messages to the SPICE server causing a heap overflow leading to a crash or possible code execution.

Q: How urgent is CVE-2016-9577?

Priority 54/100. High severity; On your watchlist

This month

HIGH 7.5WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2016-9577 is a high-severity flaw (CVSS 7.5) affecting spice, debian linux, enterprise linux desktop. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was discovered in SPICE before 0.13.90 in the server's protocol handling. An authenticated attacker could send crafted messages to the SPICE server causing a heap overflow leading to a crash or possible code execution.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Weakness	CWE-20, CWE-122, CWE-119
Published	2018-07-27
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: debian · redhat · spice project

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

Am I affected?

Timeline

2018-07-27 20:29 UTCPublished CVE record published
2026-06-17 00:56 UTCUpdated Record last modified

spice project spice UPGRADE

Affected: < 0.13.90

Fixed in: 0.13.90

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.13.90 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade spice

Note

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

debian debian linux MITIGATE

Affected: 8.0

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.

redhat enterprise linux desktop MITIGATE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

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.

redhat enterprise linux server MITIGATE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

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.

redhat enterprise linux server aus MITIGATE

Affected: 7.3 · 7.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.3

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.

redhat enterprise linux server eus MITIGATE

Affected: 7.3 · 7.4 · 7.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.3

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-2016-9577?

spice: upgrade to 0.13.90; debian linux: mitigate or apply the listed mitigation; enterprise linux desktop: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-9577 being exploited?

CVE-2016-9577 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-2016-9577 affect?

CVE-2016-9577 affects spice, debian linux, enterprise linux desktop. Severity is high (CVSS 7.5). A vulnerability was discovered in SPICE before 0.13.90 in the server's protocol handling. An authenticated attacker could send crafted messages to the SPICE server causing a heap overflow leading to a crash or possible code execution.

How urgent is CVE-2016-9577?

Priority 54/100. High severity; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2021-20201 MEDIUM 5.3 UPGRADE MITIGATE A flaw was found in spice in versions before 0.14.92
CVE-2020-14355 MEDIUM 6.6 UPGRADE DOWNGRADE Multiple buffer overflow vulnerabilities were found in the QUIC image decoding process of the SPICE remote dis
CVE-2019-3813 HIGH 7.5 UPGRADE MITIGATE Spice, versions 0.5.2 through 0.14.1, are vulnerable to an out-of-bounds read due to an off-by-one error in me
CVE-2018-10893 HIGH 7.6 MITIGATE Multiple integer overflow and buffer overflow issues were discovered in spice-client's handling of LZ compress
CVE-2018-10873 HIGH 8.3 UPGRADE MITIGATE A vulnerability was discovered in SPICE before version 0.14.1 where the generated code used for demarshalling

References

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