CVE-2017-11654: An out-of-bounds read and write flaw was found in the way SIPcrack 0.2 processed SIP traffic, because 0x00 ter

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MEDIUM 5.9REMOTEDOWNGRADE

CVE-2017-11654 is a medium-severity flaw (CVSS 5.9) affecting sipcrack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An out-of-bounds read and write flaw was found in the way SIPcrack 0.2 processed SIP traffic, because 0x00 termination of a payload array was mishandled. A remote attacker could potentially use this flaw to crash the sipdump process by generating specially crafted SIP traffic.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-125, CWE-787
Published	2017-07-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sipcrack project

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

Am I affected?

Timeline

2017-07-26 14:29 UTCPublished CVE record published
2026-06-17 01:02 UTCUpdated Record last modified

sipcrack project sipcrack DOWNGRADE

Affected: 0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.2 (Debian / Ubuntu)

apt-cache madison sipcrack sudo apt install sipcrack=<VERSION_BEFORE_0.2> sudo apt-mark hold sipcrack

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

dnf --showduplicates list sipcrack sudo dnf downgrade sipcrack-<VERSION_BEFORE_0.2> sudo dnf versionlock add sipcrack

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.

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-2017-11654?

sipcrack: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-11654 being exploited?

CVE-2017-11654 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-2017-11654 affect?

CVE-2017-11654 affects sipcrack. Severity is medium (CVSS 5.9). An out-of-bounds read and write flaw was found in the way SIPcrack 0.2 processed SIP traffic, because 0x00 termination of a payload array was mishandled. A remote attacker could potentially use this flaw to crash the sipdump process by gene

How urgent is CVE-2017-11654?

Priority 51/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2017-11655 HIGH 7.5 DOWNGRADE A memory leak was found in the way SIPcrack 0.2 handled processing of SIP traffic, because a lines array was m

References

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