CVE-2023-27596: OpenSIPS is a Session Initiation Protocol (SIP) server implementation

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HIGH 7.5REMOTEUPGRADE

CVE-2023-27596 is a high-severity flaw (CVSS 7.5) affecting opensips. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.8 and 3.2.5, OpenSIPS crashes when a malformed SDP body is sent multiple times to an OpenSIPS configuration that makes use of the `stream_process` function. This issue was discovered during coverage guided fuzzing of the function `codec_delete_except_re`. By abusing this vulnerability, an attacker is able to crash the server. It affects configurations con

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-770
Published	2023-03-15
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: opensips

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

Am I affected?

Timeline

2023-03-15 21:15 UTCPublished CVE record published
2026-06-17 05:45 UTCUpdated Record last modified

opensips opensips UPGRADE

Affected: < 3.1.8 · >= 3.2.0 and < 3.2.5

Fixed in: 3.1.8, 3.2.5

Safe to downgrade to: a release before 3.2.0

1. Check installed version

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

2. UPGRADE to 3.1.8 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opensips

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.2.0 (Debian / Ubuntu)

apt-cache madison opensips sudo apt install opensips=<VERSION_BEFORE_3.2.0> sudo apt-mark hold opensips

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list opensips sudo dnf downgrade opensips-<VERSION_BEFORE_3.2.0> sudo dnf versionlock add opensips

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-2023-27596?

opensips: upgrade to 3.1.8, 3.2.5. Exact commands for each OS are on this page.

Is CVE-2023-27596 being exploited?

CVE-2023-27596 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-2023-27596 affect?

CVE-2023-27596 affects opensips. Severity is high (CVSS 7.5). OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.8 and 3.2.5, OpenSIPS crashes when a malformed SDP body is sent multiple times to an OpenSIPS configuration that makes use of the `stream_process`

How urgent is CVE-2023-27596?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-28099 MEDIUM 5.9 UPGRADE OpenSIPS is a Session Initiation Protocol (SIP) server implementation
CVE-2023-28098 MEDIUM 5.9 UPGRADE OpenSIPS is a Session Initiation Protocol (SIP) server implementation
CVE-2023-28097 HIGH 7.5 UPGRADE OpenSIPS is a Session Initiation Protocol (SIP) server implementation
CVE-2023-28096 MEDIUM 4.5 UPGRADE OpenSIPS, a Session Initiation Protocol (SIP) server implementation, has a memory leak starting in the 2.3 bra
CVE-2023-28095 HIGH 7.5 UPGRADE OpenSIPS is a Session Initiation Protocol (SIP) server implementation

References

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