CVE-2018-7552: There is an invalid free in Mapping::DoubleHash::clear in mapping.cpp that leads to a Segmentation fault in sa

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CRITICAL 9.8REMOTEWATCHLISTDOWNGRADEMITIGATE

CVE-2018-7552 is a critical-severity flaw (CVSS 9.8) affecting sam2p, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

There is an invalid free in Mapping::DoubleHash::clear in mapping.cpp that leads to a Segmentation fault in sam2p 0.49.4. A crafted input will lead to a denial of service or possibly unspecified other impact.

Why this priority

Critical severity
Public exploit reference
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	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-119
Published	2018-02-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · sam2p project

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

Am I affected?

Timeline

2018-02-28 06:29 UTCPublished CVE record published
2026-06-17 02:03 UTCUpdated Record last modified

sam2p project sam2p DOWNGRADE

Affected: 0.49.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.49.4

1. Check installed version

apt-cache policy sam2p || rpm -q sam2p || sam2p --version

2. No fixed release: DOWNGRADE to a release before 0.49.4 (Debian / Ubuntu)

apt-cache madison sam2p sudo apt install sam2p=<VERSION_BEFORE_0.49.4> sudo apt-mark hold sam2p

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list sam2p sudo dnf downgrade sam2p-<VERSION_BEFORE_0.49.4> sudo dnf versionlock add sam2p

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: 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · root · FIXED · 6.40.04-7.fc46 · FEDORA-2026-7329868400 · source

sudo dnf upgrade --advisory=FEDORA-2026-7329868400

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/pts/sam2p/issues/30

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-2018-7552?

sam2p: downgrade or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-7552 being exploited?

CVE-2018-7552 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-2018-7552 affect?

CVE-2018-7552 affects sam2p, debian linux. Severity is critical (CVSS 9.8). There is an invalid free in Mapping::DoubleHash::clear in mapping.cpp that leads to a Segmentation fault in sam2p 0.49.4. A crafted input will lead to a denial of service or possibly unspecified other impact.

How urgent is CVE-2018-7552?

Priority 70/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2020-19492 HIGH 7.8 DOWNGRADE There is a floating point exception in ReadImage that leads to a Segmentation fault in sam2p 0.49.4
CVE-2020-19491 HIGH 7.8 DOWNGRADE There is an invalid memory access bug in cgif.c that leads to a Segmentation fault in sam2p 0.49.4
CVE-2018-7554 CRITICAL 9.8 DOWNGRADE MITIGATE There is an invalid free in ReadImage in input-bmp.ci that leads to a Segmentation fault in sam2p 0.49.4
CVE-2018-7553 CRITICAL 9.8 DOWNGRADE MITIGATE There is a heap-based buffer overflow in the pcxLoadRaster function of in_pcx.cpp in sam2p 0.49.4
CVE-2018-7551 CRITICAL 9.8 DOWNGRADE MITIGATE There is an invalid free in MiniPS::delete0 in minips.cpp that leads to a Segmentation fault in sam2p 0.49.4

References

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