CVE-2023-36844
Juniper Junos OS: EX Series PHP External Variable Modification
As of , CVE-2023-36844 in Juniper Junos OS is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.
- Exploited
- Yes: CISA listed it on 13 November 2023
- US federal deadline
- 17 November 20234 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.90Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- EPSS when listed
- 0.03 on 13 November 2023EPSS on the day CISA listed it.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- Vendor advice: supportportal.juniper.netLinks below, from CISA's entry.
What CISA says to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA's required action
What the flaw is
Juniper Junos OS on EX Series contains a PHP external variable modification vulnerability that allows an unauthenticated, network-based attacker to control certain, important environment variables. Using a crafted request an attacker is able to modify certain PHP environment variables, leading to partial loss of integrity, which may allow chaining to other vulnerabilities.
CISA's description
A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to control certain, important environment variables. Using a crafted request an attacker is able to modify certain PHP environment variables leading to partial loss of integrity, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on EX Series: * All versions prior to 20.4R3-S9; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S7; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S4; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R3-S1; * 22.4 versions prior to 22.4R2-S2, 22.4R3; * 23.2 versions prior to 23.2R1-S1, 23.2R2.
The CVE record's description, from juniper
- CVE published
- 17 August 2023
- Assigned by
- juniper
- CVSS
- 5.3 Medium (CVSS 3.1, from the CNA)
- CWE-473
- PHP External Variable Modification
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- yes
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
Junos OS: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2023-36845EX Series and SRX Series PHP External Variable Modification | Juniper Junos OS | Patch this weekMetasploit module; EPSS 0.95 | 0.95 | ||
| CVE-2023-36846SRX Series Missing Authentication for Critical Function | Juniper Junos OS | Patch this weekEPSS 0.93 | 0.93 | ||
| CVE-2023-36847EX Series Missing Authentication for Critical Function | Juniper Junos OS | Patch this weekEPSS 0.83 | 0.83 | ||
| CVE-2020-1631Path Traversal | Juniper Junos OS | Patch soon | 0.05 | ||
| CVE-2025-21590Improper Isolation or Compartmentalization | Juniper Junos OS | Patch soon | 0.02 | ||
| CVE-2023-36851SRX Series Missing Authentication for Critical Function | Juniper Junos OS | Patch soon | 0.01 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org