CVE-2023-44177
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA Stack-based Buffer Overflow vulnerability in the CLI command of Juniper Networks Junos and Junos EVO allows a low privileged attacker to execute a specific CLI commands leading to Denial of Service. Repeated actions by the attacker will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks: Junos OS: * All versions prior to 19.1R3-S10; * 19.2 versions prior to 19.2R3-S7; * 19.3 versions prior to 19.3R3-S8; * 19.4 versions prior to 19.4R3-S12; * 20.2 versions prior to 20.2R3-S8; * 20.4 versions prior to 20.4R3-S8; * 21.2 versions prior to 21.2R3-S6; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S4; * 22.1 versions prior to 22.1R3-S3; * 22.2 versions prior to 22.2R3-S1; * 22.3 versions prior to 22.3R3; * 22.4 versions prior to 22.4R2. Junos OS Evolved: * All versions prior to 20.4R3-S8-EVO; * 21.2 versions prior to 21.2R3-S6-EVO; * 21.3 versions prior to 21.3R3-S5-EVO; * 21.4 versions prior to 21.4R3-S4-EVO; * 22.1 versions prior to 22.1R3-S3-EVO; * 22.2 versions prior to 22.2R3-S1-EVO; * 22.3 versions prior to 22.3R3-EVO; * 22.4 versions prior to 22.4R2-EVO.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA stack-based buffer overflow vulnerability exists in the CLI command parsing component of Juniper Networks Junos and Junos EVO operating systems. A low-privileged attacker with CLI access can trigger the overflow by executing a specific malformed CLI command, causing a denial of service. Repeated exploitation leads to sustained DoS conditions.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 20.4= 20.4= 21.2= 21.3= 21.4= 22.1= 22.2= 22.3= 22.4< 20.4= 20.4= 21.2= 21.3= 21.4= 22.1= 22.2= 22.3= 22.4CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the Junos product variantExecute 'show version' or 'show version detail' at the CLI prompt to determine if the device is running Junos or Junos EVOAffected if The device runs Juniper Junos or Junos EVO
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Determine the installed Junos versionFrom the 'show version' output, record the exact version string displayed (for example, 21.4R3 or 22.2R1)Affected if The installed version matches any of these: < 20.4, = 20.4, = 21.2, = 21.3, = 21.4, = 22.1, = 22.2, = 22.3, = 22.4
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Confirm CLI access exists on the deviceVerify that CLI (commit, operational, or configuration mode) is accessible and functional on the deviceAffected if CLI access is available to a low-privileged user (the vulnerability is exploitable through CLI command parsing)
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Review the specific CLI command that triggers the overflowRefer to the Juniper Networks security advisory for the exact malformed CLI command syntax required to trigger this vulnerabilityAffected if A user can execute the specific malformed CLI command described in the advisory
You are affected if your device runs Junos or Junos EVO AND your installed version matches any of the listed affected versions AND CLI access is available to an attacker who can execute the malformed command.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped20.4
Apply the vendor-supplied software updates that address this vulnerability. Refer to the Juniper Networks security advisory for the specific patched versions corresponding to each affected Junos OS and Junos EVO release train.
Junos OS: 22.4R2 or later; Junos OS Evolved: 22.4R2-EVO or later (or the corresponding R3-Sx release for your branch)
- 1. Identify the current Junos OS or Junos OS Evolved version running on the device using 'show version'
- 2. Based on the installed version, plan upgrade to the minimum fixed release for your branch: For 19.1.x upgrade to 19.1R3-S10 or later; For 19.2.x upgrade to 19.2R3-S7 or later; For 19.3.x upgrade to 19.3R3-S8 or later; For 19.4.x upgrade to 19.4R3-S12 or later; For 20.2.x upgrade to 20.2R3-S8 or later; For 20.4.x upgrade to 20.4R3-S8 or later; For 21.2.x upgrade to 21.2R3-S6 or later; For 21.3.x
- 3. For Junos OS Evolved: Upgrade to 20.4R3-S8-EVO, 21.2R3-S6-EVO, 21.3R3-S5-EVO, 21.4R3-S4-EVO, 22.1R3-S3-EVO, 22.2R3-S1-EVO, 22.3R3-EVO, or 22.4R2-EVO respectively
- 4. Download the appropriate Junos upgrade package from the Juniper Networks support portal
- 5. Upload the upgrade package to the device via FTP/SCP
- 6. Execute the upgrade command: 'request system software add <package_name>' for Junos OS or follow the standard upgrade procedure for Junos OS Evolved
- 7. Reboot the device after upgrade completes using 'request system reboot'
- 8. Verify the new version is installed and the device is functioning normally using 'show version'
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2023-44177 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-44177 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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